Backpacks and foldable backpacks

Abstract

To provide a rucksack enabling parcels to be carried in a distributed manner when needed.SOLUTION: A rucksack 1000 comprises: a first rucksack 1 comprising a first storage portion 11 for storing a parcel, and a pair of first shoulder belts 12 mounted in a rear portion 21b of the first storage portion 11; and a second rucksack 2 which is a foldable rucksack including a second storage portion 21 for storing the parcel and a pair of second shoulder belts 22 mounted in the rear portion 21b of the second storage portion 21, and is detachably mounted to the first storage portion 11 in a folded state.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a backpack. [Background technology]

[0002] As a conventional technique, a backpack containing disaster prevention supplies for two people has been known (see, for example, Non-Patent Document 1).

[0003] Furthermore, as prior art, a helmet that is worn on the wearer's head and can be stored in a backpack such as the one described above, and is retractable so that the wearer can shrink it and store it when not in use, is known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5957590 (page 1, Figure 1, etc.) [Non-patent literature]

[0005] [Non-Patent Document 1] "Disaster Preparedness Backpack Set for 2 People, 55-Piece Set with Food, White, BRS-55 G285227 | Iris Plaza | Iris Ohyama Official Online Store," [online], Iris Ohyama Co., Ltd., [Searched April 12, 2021], Internet<URL:https: / / www.irisplaza.co.jp / index.php?KB=SHOSAI&SID=G285227> Summary of the Invention [Problem to be solved by the invention]

[0006] With conventional backpacks like those described above, when there is a lot of luggage to store, it becomes difficult to carry the luggage for long periods of time, and the luggage no longer fits in the backpack. Therefore, there has been a technical demand for the ability to carry luggage all together or spread out depending on the situation.

[0007] The present invention has been made in view of the above circumstances, and aims to provide a backpack that allows luggage to be carried in a distributed manner when necessary, and a foldable backpack that can be used to distribute luggage when necessary. [Means for solving the problem]

[0008] The backpack of the present invention comprises a first backpack having a first storage section in which luggage is stored and a pair of first shoulder straps attached to the back side of the first storage section, a second storage section in which luggage is stored and a pair of second shoulder straps attached to the back side of the second storage section, and a foldable backpack having a second storage section in which luggage is stored and a pair of second shoulder straps attached to the back side of the second storage section, and the second backpack being detachably attached to the first storage section when folded.

[0009] With this configuration, if necessary, luggage can be distributed and carried between the first rucksack and the second rucksack.

[0010] In addition, the backpack of the present invention may be configured such that the second backpack is attached to the top of the first storage section.

[0011] With this configuration, the folded second backpack is attached to the outside of the first backpack, making it easy to remove the second backpack when needed. It also helps to minimize changes in the left-right balance of the backpack when the second backpack is attached or detached.

[0012] Furthermore, in the backpack of the present invention, the first storage section may have a first lid section near the top that can be opened and closed to allow items to be stored in and removed from the first storage section, and a first fastener may be provided on the back side of the first lid section for removably fastening a first helmet.

[0013] With this configuration, the helmet can be easily attached to the first lid portion.

[0014] The backpack of the present invention may also be configured such that a first helmet is removably fixed to the inside of the first lid portion by a first fixing device.

[0015] With this configuration, the helmet can be easily removed by opening the first lid portion.

[0016] In addition, in the backpack of the present invention, it is preferable that the first helmet fixed by the first fixing device is a deformable helmet that has been deformed into a small size.

[0017] This configuration ensures a large capacity for storing luggage other than a helmet within the first storage compartment.The backpack of the present invention may also be configured such that, when folded, the upper part of the folded second storage compartment and the second shoulder straps are stored in the lower part of the second storage compartment, and a second lid that can be opened and closed is attached to the part of the lower part of the second storage compartment that becomes the upper end when folded.

[0018] With this configuration, the second rucksack that has been folded and stored can be unfolded by opening the second lid portion.

[0019] Furthermore, in the backpack of the present invention, an auxiliary storage section is provided on the bottom side of the lower part of the second storage section, separated from the upper side of the lower part, and an opening and closing section is provided on the side of the auxiliary storage section which can be opened and closed to allow luggage to be put in and taken out of the auxiliary storage section, and the upper part of the second storage section and the second shoulder straps of the second backpack may be stored in the lower part of the second storage section, above the auxiliary storage section, when folded.

[0020] This configuration allows items to be placed in and removed from the auxiliary storage section regardless of whether the second backpack is in a folded or unfolded state.

[0021] In the rucksack of the present invention, the auxiliary storage section may be sized to be able to store a second helmet.

[0022] With this configuration, the second helmet can be stored in the auxiliary storage section.

[0023] The backpack of the present invention may also be configured so that a fastener for removably fastening a second helmet is provided on the upper or lower inner surface of the auxiliary storage section.

[0024] With this configuration, the helmet can be secured and stored in the auxiliary storage section. Also, by storing the helmet in the auxiliary storage section, for example, even if items are placed in the second storage section of the second rucksack above the auxiliary storage section, the helmet can be easily removed from the opening and closing section, making it possible to quickly use the helmet in an emergency, etc.

[0025] The backpack of the present invention may also be configured so that a second helmet is stored in the auxiliary storage section.

[0026] With this configuration, the helmet can be easily removed by opening the opening and closing part.

[0027] In the backpack of the present invention, it is preferable that the second helmet stored in the auxiliary storage section is a modified helmet that has been deformed into a small size.

[0028] This configuration allows the size of the auxiliary storage section to be reduced, thereby reducing the size of the second backpack, and therefore the size of the backpack itself.

[0029] The foldable backpack of the present invention is a foldable backpack that has a storage section for storing luggage and a pair of shoulder straps attached to the back of the storage section; when folded, the upper part of the storage section is folded and this upper part and the shoulder straps are stored in the lower part of the storage section, and a lid that can be opened and closed is attached to the part of the lower part of the storage section that becomes the upper end when folded.

[0030] With this configuration, it can be unfolded into a backpack when needed and used to distribute luggage, and when not needed it can be folded up to make it compact.

[0031] Furthermore, the foldable backpack of the present invention may be configured such that an auxiliary storage section is provided on the bottom side of the lower part of the storage section, separated from the upper part of the lower part, and an opening / closing section is provided on the side of the auxiliary storage section which can be opened and closed to allow luggage to be put in and taken out of the auxiliary storage section, and the upper part of the storage section and the shoulder straps may be stored in the lower part of the storage section, above the auxiliary storage section, when folded.

[0032] This configuration allows items to be placed in and removed from the secondary storage compartment whether the foldable backpack is in a folded or unfolded state.

[0033] In the foldable backpack of the present invention, the auxiliary storage section may be sized to be able to store a helmet.

[0034] With this configuration, the helmet can be stored in the auxiliary storage section. [Effects of the Invention]

[0035] The backpack or the like according to the present invention allows the stored luggage to be dispersed when necessary. [Brief explanation of the drawings]

[0036] [Figure 1] 1(a)), a front view (FIG. 1(b)), a rear view (FIG. 1(b)), a right side view (FIG. 1(c)), a left side view (FIG. 1(d)), a plan view (FIG. 1(e)), and a bottom view (FIG. 1(f)) of a backpack according to an embodiment of the present invention. [Figure 2] A front view (Fig. 2(a)), a back view (Fig. 2(b)), a right side view (Fig. 2(c)), a left side view (Fig. 2(d)), a plan view (Fig. 2(e)), and a bottom view (Fig. 2(f)) of the first backpack. [Figure 3] The second backpack is shown in a front view (Fig. 3(c)), a back view (Fig. 3(b)), a right side view (Fig. 3(c)), a left side view (Fig. 3(d)), a plan view (Fig. 3(e)), and a bottom view (Fig. 3(f)) of the second backpack in an unfolded state. [Figure 4] The second backpack is shown in a folded state in a front view (FIG. 4(C)), a rear view (FIG. 4(b)), a right side view (FIG. 4(c)), a left side view (FIG. 4(d)), a plan view (FIG. 4(e)), and a bottom view (FIG. 4(f)). [Figure 5] Perspective views of the back side of the backpack from different directions (Fig. 5(a) and Fig. 5(b)) [Figure 6] 6(a) and 6(b) are perspective views of the back side of the first backpack as viewed from different directions. [Figure 7]FIG. 10 is a perspective view of the backpack with the second backpack in a folded state removed from the first backpack; [Figure 8] 8(a) is a perspective view showing the unfolded state of the second backpack; FIG. 8(b) is a perspective view showing the front side of the folded backpack from above; and FIG. 8(c) is a perspective view showing the front side of the folded backpack from below. [Figure 9] 9(a)-9(c) are perspective views showing the rear side and vicinity of the first lid portion of the first backpack when the first lid portion is open, and FIGS. 9(d) and 9(e) are perspective views showing an example of a first helmet stored in the backpack of the present embodiment. [Figure 10] 10(a) to 10(c) are perspective views showing an example of a process of unfolding the second backpack. [Figure 11] FIG. 11(a) is a perspective view of the second backpack in a folded state and the upper part of the first backpack as seen from the front side, for explaining how the second backpack in a folded state is attached to the first backpack in the same backpack, and FIG. 11(b) is a perspective view of the second backpack in a folded state and the upper part of the first backpack as seen from the back side. [Figure 12] 12(a) and 12(b) are perspective views showing an example of the second backpack when the opening / closing section is open in a folded state, and FIG. 12(c) is a longitudinal cross-sectional view of the second backpack when folded. [Figure 13] 13(a) and 13(b) are perspective views showing an example of the second backpack in an unfolded state with the opening and closing section open, and FIG. 13(c) is a longitudinal cross-sectional view showing the upper part unfolded. DETAILED DESCRIPTION OF THE INVENTION

[0037] Hereinafter, embodiments of a backpack and the like will be described with reference to the drawings. Note that components with the same reference numerals in the embodiments perform similar operations, and therefore repeated description may be omitted.

[0038] (Embodiment) Figure 1 shows a front view (Figure 1(a)), a back view (Figure 1(b)), a right side view (Figure 1(c)), a left side view (Figure 1(d)), a plan view (Figure 1(e)), and a bottom view (Figure 1(f)) of the backpack in this embodiment.

[0039] Figure 2 shows a front view (Figure 2(a)), a back view (Figure 2(b)), a right side view (Figure 2(c)), a left side view (Figure 2(d)), a plan view (Figure 2(e)), and a bottom view (Figure 2(f)) of the first backpack in this embodiment.

[0040] Figure 3 shows a front view (Figure 3(c)), a back view (Figure 3(b)), a right side view (Figure 3(c)), a left side view (Figure 3(d)), a plan view (Figure 3(e)), and a bottom view (Figure 3(f)) of the second backpack of this embodiment in an unfolded state.

[0041] Figure 4 shows a front view (Figure 4(c)), a back view (Figure 4(b)), a right side view (Figure 4(c)), a left side view (Figure 4(d)), a plan view (Figure 4(e)), and a bottom view (Figure 4(f)) of the second backpack of this embodiment in a folded state.

[0042] FIG. 5 is a perspective view of the backpack in this embodiment as seen from the upper left (FIG. 5(a)) and a perspective view as seen from the upper right (FIG. 5(b)).

[0043] FIG. 6 is a perspective view of the first rucksack of this embodiment as seen from the upper left (FIG. 6(a)) and from the upper right (FIG. 6(b)).

[0044] FIG. 7 is a perspective view of the backpack of this embodiment, showing the second backpack in a folded state detached from the first backpack.

[0045] Figure 8 shows an oblique view of the second backpack of this embodiment in an unfolded state (Figure 8(a)), an oblique view of the second backpack in a folded state seen from above (Figure 8(b)), and an oblique view of the second backpack in a folded state seen from below (Figure 8(c)).

[0046] Figure 9 is a perspective view (Figures 9(a)-9(c)) showing the rear side and vicinity of the first lid portion of the first backpack when the first lid portion is open, and a perspective view (Figures 9(d) and 9(e)) showing an example of a first helmet, which is a transformable helmet that can be transformed into a small size and stored in the backpack of this embodiment. Figure 9(d) shows the first helmet in a deflated state, and Figure 9(e) shows the first helmet in an unfolded state.

[0047] FIG. 10 is a perspective view (FIG. 10(a) to FIG. 10(c)) showing an example of the process of unfolding the second rucksack in the present embodiment from a folded state.

[0048] Figure 11 shows a perspective view (Figure 11(a)) of the second backpack in a folded state and the upper part of the first backpack as seen from the front, and a perspective view (Figure 11(b)) of the second backpack and the upper part of the first backpack as seen from the rear, for illustrating how the second backpack in a folded state is attached to the first backpack. Figure 11(b) shows a cutaway view of a portion of the cover member on the rear side of the second backpack in a folded state.

[0049] 12A and 12B are perspective views (FIGS. 12A and 12B) showing an example of the second rucksack of this embodiment with the top folded and the opening / closing section open, and a longitudinal cross-sectional view (FIG. 12C) perpendicular to the front with the top folded. FIGS. 12A and 12C show the state in which the second helmet is stored, and FIG. 12B shows the state in which it is not stored.

[0050] FIG. 13 shows perspective views (FIG. 13(a) and FIG. 13(b)) of an example of the second rucksack of this embodiment in an unfolded state with the opening and closing section open, and a longitudinal cross-sectional view (FIG. 13(c)) perpendicular to the front with the upper part unfolded. FIG. 13(a) and (FIG. 13(c)) show the state in which the second helmet is stored, and FIG. 13(b) shows the state in which it is not stored.

[0051] The rucksack 1000 of this embodiment is a rucksack that stores, for example, disaster prevention supplies as one or more pieces of luggage. The disaster prevention supplies here are a concept that also includes, for example, evacuation supplies. The disaster prevention supplies may include, for example, drinking water, food, flashlights, mobile batteries, toilet supplies, etc. The disaster prevention supplies may include one or more helmets, such as a first helmet 3a and a second helmet 3b, which will be described later. It is preferable that the rucksack 1000 stores evacuation supplies for two or more people. However, the luggage stored in the rucksack 1000 is not limited to the disaster prevention supplies described above. For example, the rucksack 1000 may be a rucksack that stores leisure goods as luggage. Note that luggage may also be considered as stored items.

[0052] The backpack 1000 comprises a first backpack 1 and a second backpack 2. As shown in Figures 1(a) to 1(f), 5(a), 5(b), and other figures, the backpack 1000 comprises the first backpack 1 and the second backpack 2 in a folded state attached to the first backpack 1. The backpack 1000 may be considered, for example, to be a backpack that can be separated into the first backpack 1 and the second backpack 2.

[0053] As shown in Figures 2(a)-2(f), 6(a) and 6(b), the first backpack 1 has a first storage section 11 in which luggage is stored, and a pair of first shoulder straps 12 attached to the back section 11b of the first storage section 11.

[0054] The first storage section 11 of the first backpack 1 has a generally D-shaped cross section and a generally cylindrical shape that extends vertically, with the upper and lower ends closed by generally flat surfaces. The back surface 11b of the first storage section 11 is generally flat.

[0055] The first storage section 11 has a first lid 111 near the top that can be opened and closed to load and unload luggage into and from the first storage section 11. The "near the top" refers to, for example, a height distance from the top of the first storage section 11 that is 20 cm or less, preferably 10 cm or less, and more preferably 5 cm or less. However, the "near the top" is not limited to this range. Specifically, a two-way zipper 111a is provided near the top of the first storage section 11 along the lateral outer periphery, except for at least a portion of the back side. The first lid 111 removably engages a portion of the first storage section 11 above the zipper 111a with a portion of the first storage section 11 below the zipper 111a via the zipper 111a. The first lid 111 is attached to a portion of the back side 11b of the first storage section 11 that is not provided with the zipper 111a, below the zipper 111a, and opens from the front side.

[0056] The shape and structure of first lid 111 are not limited to those described above. For example, first lid 111 may be configured to be closed using a fastener such as a button other than a zipper so as to be openable and closable with respect to a portion below first lid 111. Furthermore, first lid 111 may be attached to a portion of first storage section 11 below first lid 111 in any manner, or first lid 111 may be attached to a portion of first storage section 11 below first lid 111 in an area other than the front side, such as the back side. Furthermore, the entire first lid 111 may be configured to be detachably engaged with the lower portion by a zipper.

[0057] Furthermore, the shape, size, structure, etc. of the fastener 111a in this embodiment are not limited to those shown in the drawings, and may be of any shape. For example, the fastener 111a may be a two-way opening fastener or a one-way opening fastener. This also applies to other fasteners, etc., described below. The shape of the fastener is a concept that includes, for example, fastener tabs, etc.

[0058] The top surface of the first lid portion 111 is generally flat, and the back side of the first lid portion 111 is also generally flat. As shown in FIGS. 9(a) to 9(c), an extendable first helmet 3a as shown in FIGS. 9(d) and 9(e) that can be contracted to a smaller size can be attached to the back side of the first lid portion 111. For example, on the back side of the first lid portion 111, a pair of strip-shaped flaps 113 equipped with hook-and-loop fasteners 113b are provided on both sides of the position where the first helmet 3a is fixed, as fasteners for fixing the extendable first helmet 3a in the contracted state. Specifically, as shown in FIG. 9(c), members 113a constituting the hook-and-loop fasteners 113b are attached over a predetermined length to the overlapping opposing surfaces of each flap 113. The first helmet 3a shown in FIG. 9(e) is shrunk as shown in FIG. 9(d) and placed behind the first lid 111. The flaps 113 are then connected to each other so as to cover the placed first helmet 3a, and the length of the overlapping portions when connected is adjusted appropriately, and the connected flaps 113 press the shrunk first helmet 3a against the backside of the first lid 111, thereby fixing the first helmet 3a to the backside of the first lid 111 as shown in FIG. 5(a). The first helmet 3a is fixed by the flaps 113 so that, for example, its height direction coincides with the height direction of the first rucksack 1. When the first helmet 3a is not attached, the flaps 113 are connected to each other in an overlapping manner, for example, as shown in FIG. 9(b).

[0059] In the following, in this embodiment, an example will be described in which the first helmet 3a is an extendable helmet that has a thin shape when contracted, as shown in Figs. 9(d) and 9(e). This helmet has a structure similar to that of the helmet described in Patent Document 1, for example. Note that the contracted state of the first helmet 3a is not limited to the shape shown in Fig. 9(d). The size of the first helmet 3a when contracted is, for example, approximately 180 to 250 mm in width, approximately 250 to 300 mm in depth, and approximately 35 to 45 mm in height. However, the size is not limited to these.

[0060] The material of the flaps 113 may be, for example, fiber, foam rubber, a synthetic resin sheet, or a combination of two or more of these. The material of the flaps 113 may be, for example, a material that is normally used for flaps, belts, etc., used to fasten things. The material of the flaps 113 is preferably an elastic material. Furthermore, the method for connecting the flaps together is not limited to the hook-and-loop fastener 113b, and may be, for example, a button, a hook-and-loop fastener, a buckle, etc. It goes without saying that the first helmet 3a stored in a bag (not shown), a case (not shown), or the like may be fastened by the pair of flaps 113, which are fasteners.

[0061] Furthermore, as a fastener for fastening the first helmet 3a, a fastener other than the two flaps 113 as described above may be used, such as a length-adjustable belt (not shown) that can be connected by hook-and-loop fasteners or buckles, or an elastic band. The number of flaps 113 used as a fastener is not limited to two. Note that if a fastener such as a pair of flaps 113 is not necessary (for example, if the first helmet is stored without being fastened), the fastener may be omitted.

[0062] The first helmet 3a shown in Figure 9(e) is obtained by undoing the connection of the flap 113, which is a fixing device, removing the first helmet 3a in a contracted state from the back side of the first lid portion 111, and stretching the first helmet 3a.

[0063] Here, as shown in Figure 9(a) and other figures, the case of attaching the telescopic first helmet 3a in a shrunk state has been described, but the first helmet 3a attached by the fixing device is not limited to a telescopic helmet in a shrunk state as long as it is a deformable helmet in a compact deformed state, and may be, for example, a foldable helmet in a compact deformed state. Furthermore, the first helmet 3a attached to the back side of the first lid portion 111 is not limited to a deformable helmet that can be deformed into a compact state, such as a telescopic helmet, and may be a non-deformable helmet. As a non-deformable helmet, it is preferable to use a relatively small, portable helmet.

[0064] The first helmet 3a may be removably fixed in advance to the back side of the first lid portion 111 of the first rucksack 1 by a first fixing device such as a flap 113. For example, the rucksack 1000 may already have the first helmet 3a attached to the back side of the first lid portion 111.

[0065] The front section 11a of the first backpack 1 is provided with a front pocket 112 having a generally rectangular front shape, with its bottom edge attached to the first storage section 11 and the other edges engaged with the front section 11a by a zipper 112a. Items can be placed in and removed from the front pocket 112 by opening the zipper 112a. The shape and structure of the front pocket 112 are not limited to those described above. The front pocket 112 may also be omitted.

[0066] Furthermore, a zipper 118a that opens vertically is provided on the left side surface of the first storage section 11, and opening this zipper 118a makes it possible to put items in and take them out of the first storage section 11. However, the zipper 118a may be omitted.

[0067] In addition, a side pocket 120 made of mesh material that allows items to be put in and taken out from the top is provided in the area extending from the lower right side surface to the right end of the front of the first storage section 11. However, the side pocket 120 may be omitted.

[0068] Stripe-shaped reflectors 119 that reflect light are attached to the left and right side surfaces and front surface 11a of first storage section 11. The shape, number, and mounting position of reflectors 119 are not important. Also, reflectors 119 may be omitted.

[0069] The pair of first shoulder belts 12 are left and right shoulder belts. The upper and lower ends of each first shoulder belt 12 are attached to the upper and lower sides of the back surface 11b of the first storage section 11, respectively. The first shoulder belts 12 may be attached in any manner. Furthermore, the attachment position of the first shoulder belts 12 is not limited to the above-described position. For example, the shoulder belts 12 may be attached to the upper or lower surface of the first storage section 11, rather than the back surface 11b. The first shoulder belts 12 have an adjuster 12a, such as a ladder lock, that can adjust the length. The shape, size, structure, etc. of the first shoulder belts 12 are not limited to the above-described shape, size, etc. Furthermore, the adjuster 12a may be omitted. For example, the first shoulder belts 12 may be similar to the shoulder belts of a typical backpack. At least one of the upper and lower ends of the shoulder belts 12 may be detachably attached to the first storage section 11.

[0070] A length-adjustable chest belt 14 is attached to the pair of shoulder belts 12 by means of an eight-ring 14b to maintain the distance between the shoulder belts 12. The chest belt 14 is connected by a side release buckle 14a. Note that the structure and attachment method of the chest belt are not limited to those described above. The chest belt 14 may also be omitted.

[0071] A handle 13 for carrying the first rucksack 1 is provided on the upper side of the back surface 11b of the first storage section 11. The shape, size, and attachment position of the handle are not important. The handle 13 may also be omitted.

[0072] As shown in FIGS. 3(a)-3(f) and 8(a), the second backpack 2 includes a second storage section 21 for storing luggage and a pair of second shoulder straps 22 attached to the back surface 21b of the second storage section 21. As shown in FIGS. 10(a)-10(c), the second backpack 2 is a foldable backpack, and in the folded state, it is detachably attached to the first storage section 11 of the first backpack 1 as shown in FIG. 7. FIGS. 1(a)-1(f) show an example in which the second backpack 2 in the folded state shown in FIG. 10(a) is attached to the upper part of the first storage section 11, specifically, to the top surface. The attachment position of the first storage section 11 is preferably the upper part of the first storage section 11, more preferably the top surface, but the attachment position of the first storage section 11 is not limited to these positions.

[0073] As shown in FIG. 10(c), the second storage section 21 of the second backpack 2 has a foldable upper section 211 shown in FIG. 3(a). The upper section 211 can be folded and stored in the lower section 212 of the second storage section 21. The upper section of the second storage section 21 is, for example, a section whose height from the top of the unfolded second backpack 2 is at least half, preferably at least two-thirds, of the overall height of the unfolded second backpack. For example, the upper section is a section that is 180 mm to 320 mm away from the top. However, the height of the second storage section 21 is not limited to the above. The lower section 212 of the second storage section 21 is a section located below the upper section 211 of the second storage section 21, specifically, a section below the upper section 211 of the second storage section 21 other than the upper section 211. The upper section 211 of the second storage section 21 can be folded in any manner. Here, the folded upper part 211 is stored in the upper part 2121 of the lower part 212 of the second storage section 21.

[0074] As shown in Figures 3(a) to 3(f), the upper part 211 of the second storage section 21 in the unfolded state has a shape that tapers upward. Specifically, the thickness of the upper part 211 of the second storage section 21, i.e., the distance between the front part 21a and the back part 21b of the upper part of the second storage section 21, decreases upward, and the width of the upper part 211 of the second storage section 21 (i.e., the length in the direction perpendicular to the thickness direction) also decreases upward. However, the shape of the upper part 211 of the second storage section 21 is not limited to the above shape.

[0075] Furthermore, a zipper 218a extending in the vertical direction for putting in and taking out luggage is provided on the upper part 211 of the front part 21a of the second storage section 21. Furthermore, a zipper 218b for putting in and taking out luggage is provided on the upper side of the side periphery 21c of the upper part 211 of the second storage section 21, which is sandwiched between the front part 21a and the back part 21b, across the left and right.

[0076] The number of fasteners provided on the upper portion 211 of the second storage section 21, the position of the fasteners, etc. are not limited to those described above. Also, an access opening (not shown) for putting in and taking out luggage may be fastened with a fastener such as a button other than a fastener.

[0077] The pair of second shoulder belts 22 are left and right shoulder belts 22. The upper ends of the shoulder belts 22 are attached to the upper side of the back surface 21b of the second storage section 21. The lower end of the right shoulder belt 22 is attached to the lower right side surface 21d of the lower portion 212 of the second storage section 21, and the lower end of the left shoulder belt 22 is attached to the lower left side surface of the lower portion 212 of the second storage section 21. At least the lower ends of the shoulder belts 22 are attached to the second storage section 21 in a detachable manner. Here, a snap hook 22a is provided at the lower end of each shoulder belt 22, and this snap hook 22a is detachably attached to D-rings 22b provided respectively below the right side surface 21d and the left side surface 21e of the lower portion 212 of the second storage section 21, thereby detachably attaching the lower ends of the shoulder belts 22 to the second storage section 21. When folding the second backpack 2, at least the lower ends of the shoulder belts 22 are detached from the second storage section 21, and the detached shoulder belts 22 are stored in the lower section 212 of the second storage section 21 together with the upper section 211 of the folded second storage section 21. The shoulder belts 22 may be folded and stored in the lower section 212. If the shoulder belts 22 have an expandable structure, the shoulder belts 22 may be stored in the lower section 212 in a contracted state, or the shoulder belts 22 may be rolled up and stored in the lower section 212. How the shoulder belts 22 are stored in the lower section 212 is not important. The upper ends of the shoulder belts 22 may also be detachably attached to the second storage section 21. In this case, the upper ends of the shoulder belts 22 may also be detached from the second storage section 21, allowing the shoulder belts 22 to be removed from the second storage section 21 and stored in the lower section 212. The method of attaching the shoulder belts 22 to the second storage section 21 is not limited to the above. The attachment position of the second shoulder belt 22 is not limited to the above position. Here, the second shoulder belt 22 has an adjuster 22c that allows the length to be adjusted, but the adjuster 22c may be omitted. The shape, size, etc. of the second shoulder belt 22 are not limited to the above. For example, the same belt as the first shoulder belt 12 can be used as the second shoulder belt 22.

[0078] The second storage section 21 has a handle 23 on the upper side of the back section 21b for carrying the second rucksack 2. However, the attachment position and structure of the handle 23 are not important. Also, the handle 23 may be omitted.

[0079] The lower part 212 of the second storage section 21 has a cylindrical shape with a closed lower end, and the cross-sectional shape in the lateral direction (in other words, the horizontal direction) of the lower part 212 of the second storage section 21 is substantially the same as, and preferably the same as, the cross-sectional shape in the lateral direction of the first storage section 11 of the first rucksack 1. However, the shape of the lower part 212 is not limited to the above-mentioned shape.

[0080] As shown in FIG. 13(c), an auxiliary storage section 2122 is provided at the bottom of the lower section 212 of the second storage section 21 of the second backpack 2, partitioned off from the upper section 212 of the lower section 212. The auxiliary storage section 2122 is partitioned off from the upper section 2121 of the lower section 212 by a partition 2123 provided at a desired height inside the lower section 212 of the second storage section 21. The partitioned section is, for example, a section separated from the upper section 2121 of the lower section 212 by a separating member. In this case, the separating member is the partition 2123. The partition 2123 here is intended to prevent, for example, luggage stored above the auxiliary storage section 2122 from moving into the auxiliary storage section 2122. However, very small objects (for example, objects less than 1 cm in size) may pass through the partition 2123 and move. The partition 2123 is attached, for example, to the inside of the front portion 21a, the back portion 21b, and the lower portion 212 of the side peripheral portion 21c so that no gaps are formed. Here, a case will be described in which the member of the partition 2123 is a sheet-like member made of the same material as the material of the upper portion of the second storage portion 21, but the material is not limited to this. For example, the partition 2123 may be made of a mesh material or the like that allows the passage of minute objects as described above.

[0081] The auxiliary storage section 2122 stores, as luggage, for example, a retractable second helmet 3b in a retracted state. In the present embodiment, the following description will be given taking as an example a case where the retractable second helmet 3b in a retracted state is stored in the auxiliary storage section 2122. Also, the description will be given taking as an example a case where the second helmet 3b is a helmet similar to the first helmet 3a, as shown in Figures 9(d) and 9(e).

[0082] It should be noted that the luggage stored in the auxiliary storage section 2122 is not limited to the second helmet 3b. Furthermore, the auxiliary storage section 2122 may store other luggage in addition to the second helmet 3b.

[0083] Furthermore, the first helmet 3a and the second helmet 3b may be the same helmet or different helmets. Similarly to the first helmet 3a, the second helmet 3b is not limited to the second helmet 3b that is expandable in the contracted state described above. For example, a helmet that can be deformed into a small size, such as an expandable helmet, similar to the helmet that can be used as the first helmet 3a described above, or a helmet that cannot be deformed, etc., can be used. However, it is preferable that the second helmet 3b stored in the auxiliary storage section 2122 be a helmet that can be deformed into a small size in the contracted state described above.

[0084] The auxiliary storage section 2122 preferably has a size that can store, for example, the retractable second helmet 3b in a retracted state. For example, the height of the auxiliary storage section 2122 is preferably a size that can store the retracted second helmet 3b so that the height direction of the second helmet 3b is the height direction of the auxiliary storage section 2122. This allows, for example, the retractable second helmet 3b in a retracted state to be stored in the auxiliary storage section 2122 so that its height direction is the height direction of the second rucksack 2, and the auxiliary storage section 2122 can be used, for example, to store such a helmet. Note that storing the second helmet 3b so that its height direction is the height direction of the auxiliary storage section 2122 may mean, for example, storing the second helmet 3b so that the apex side of the second helmet 3b is located on the upper side of the inside of the auxiliary storage section 2122 or may mean storing the second helmet 3b so that its apex side is located on the lower side of the inside of the auxiliary storage section 2122. In addition to the second helmet 3b, other luggage may be stored in the auxiliary storage section 2122.

[0085] The auxiliary storage section 2122 is provided with an opening / closing section 2126 along the horizontal outer periphery that can be opened and closed to put in and take out luggage stored in the auxiliary storage section 2122. Here, a zipper 212a is provided along the horizontal outer periphery at a height position approximately near the center of the height of the lower part 212 of the second storage section 21 of the second rucksack 2, excluding the area of ​​the back section 21b, and the part where this zipper 212a is provided serves as the opening / closing section 2126. By opening this zipper 212a, the opening / closing section 2126 can be opened vertically, as shown in FIG. 12(a). Note that instead of the zipper 212a, a fastener other than a zipper, such as a button, may be used to close the opening / closing section 2126 so that it can be opened and closed.

[0086] The structure of the opening / closing section 2126 and the position where the opening / closing section 2126 is provided are not limited to those described above. For example, the opening / closing section that allows the putting in and taking out of luggage stored in the auxiliary storage section 2122 may be a lid, slit, flap, etc. (not shown) that can be opened and closed with a zipper, button, etc. and provided on the outer periphery of the auxiliary storage section 2122. The outer periphery of the auxiliary storage section 2122 here is, for example, one or more of the front side, side side, and back side of the auxiliary storage section 2122.

[0087] 12(a) to 12(c), a pair of flaps 2131, which are fasteners for fastening the retractable second helmet 3b in a contracted state, similar to the pair of flaps 113 described in the above embodiment, are provided on the inner upper surface 2127 of the auxiliary storage section 2122 (i.e., the lower surface of the partition 2123), and these flaps 2131 enable the second helmet 3b to be fastened. For example, as shown in FIGS. 12(a) and 12(c), the second helmet 3b is removably fastened in the auxiliary storage section 2122 by the flaps 2131 so that the height direction of the second helmet 3b is the same as the height direction of the second rucksack 2.

[0088] 12(a) and 12(b), the pair of flaps 2131 are also provided with members 2131a that form hook-and-loop fasteners 2131b, similar to the flaps 113, and the flaps 2131 are detachably connected to each other by the hook-and-loop fasteners 2131b so that their lengths can be adjusted. The pair of flaps 2131 are similar to the flaps 113 of the above embodiment, and therefore a detailed description thereof will be omitted here.

[0089] In this embodiment, instead of the pair of flaps 2131, a fastener similar to the fastener for detachably fastening the first helmet 3a, other than the pair of flaps described in the above embodiment, may be provided. For example, the second helmet 3b may be detachably fastened in the auxiliary storage section 2122 by the fastener so that the height direction of the second helmet 3b coincides with the height direction of the second rucksack 2. Furthermore, instead of attaching fasteners such as the pair of flaps 2131 to the upper surface, fasteners such as the pair of flaps 2131 may be provided on the lower surface inside the auxiliary storage section 2122 so that the second helmet 3b can be fastened to the lower surface. Needless to say, the second helmet 3b stored in a bag (not shown), a case (not shown), or the like may be fastened by fasteners such as the pair of flaps 2131. Furthermore, when fasteners such as the pair of flaps 2131 are not necessary (for example, when the second helmet 3b is stored in the auxiliary storage section 2122 without being fastened), the fasteners may be omitted.

[0090] In the backpack 1000, the second helmet 3b may be stored in the auxiliary storage section 2122 in advance, and for example, the second helmet 3b may be removably fixed in advance by a fastener such as a pair of flaps 2131.

[0091] A second lid 213 that can open and close the portion that becomes the upper end when folded is provided on a portion 2120 of the lower part 212 of the second storage section 21 that becomes the upper end when folded. The portion 2120 that becomes the upper end when folded is, for example, an annular end formed on the upper side of the lower part 212 by storing the upper part 211 of the folded second storage section 21 into the lower part 212. A fastener 213a is provided along the outer periphery of the portion 2120 of the lower part 212 of the second storage section 21 that becomes the upper end when folded, and the second lid 213 and the portion 2120 that becomes the upper end when folded are detachably engaged with each other by the fastener 213a. By engaging them, the portion 2120 of the lower part 212 of the second storage section 21 that becomes the upper end when folded can be closed by the second lid 213. Here, second lid portion 213 is attached to the back side of portion 2120, which becomes the upper end when folded, and no fastener 213a is provided on this attached portion. Therefore, by opening fastener 213a, the portion of second lid portion 213 excluding this attached portion can be opened and closed vertically.

[0092] 8(a), when the upper part 211 of the second storage section 21 is unfolded (in other words, spread out), the second lid part 213 is arranged on the rear part 21b side of the second storage section 21. Here, an example is shown in which the back side of the second lid part 213 is attached to the rear side of the upper part 211 of the second storage section 21, but it does not have to be attached to the rear side.

[0093] When folding the second backpack 2, as shown in Figure 10(c), the upper part 211 of the folded second storage section 21 and the second shoulder strap 22, at least the lower end of which has been removed from the second storage section 21, are stored in the lower part 212 of the second storage section 21, and the second lid part 213 is placed over the part 2120 of the lower part 212 of the second storage section 21 that will become the upper end when folded.As shown in Figure 10(b), by closing the zipper 213a, the lower part 212 of the second storage section 21 can be transformed into a cylindrical bag shape, as shown in Figure 10(a), storing the folded upper part 211 and the second shoulder strap 22. As shown in Figures 8(b) and 8(c), this bag shape has a lateral (i.e., horizontal) cross-sectional shape that is generally, preferably the same as, the lateral cross-sectional shape of the first storage section 11 of the first backpack 1, and is generally cylindrical, preferably cylindrical. However, the shape is not limited to this. Note that the second backpack 2 folded into this bag shape may have one or more shoulder straps (not shown) or handles (not shown) attached, or the one or more shoulder straps (not shown) or handles (not shown) may be detachably attached in the folded state. In this case, the shoulder straps or handles attached after folding may be stored in the second storage section 21, etc.

[0094] When the second backpack 2 is folded, the folded upper portion 211 of the second storage section 21 and the second shoulder straps 22 are stored in the portion 2121 of the lower portion 212 of the second storage section 21, which is above the auxiliary storage section 2122, as shown in Figure 12(c).

[0095] Stripe-shaped reflectors 119 that reflect light are attached to the upper surface of the second lid portion 213 of the second storage portion 21 so as to be parallel to the left and right direction. The shape, number, and attachment position of the reflectors 119 are not important. The reflectors 119 may also be omitted.

[0096] As shown in Figures 1(a) to 1(f) and 7, the second backpack 2 in a folded state can be attached to the first backpack 1. The folded second backpack 2 is attached, for example, to the top of the first storage section 11. The top of the first storage section 11 is preferably the topmost part of the first storage section 11, for example, on the upper surface of the first storage section 11. However, the top of the first storage section 11 is not limited to the above-mentioned position. Attaching to the top of the first storage section 11 preferably means attaching to the first lid 111 of the first storage section 11, for example. In this embodiment, as an example, the bag-shaped second backpack 2 is attached so that its bottom surface faces the top surface of the first backpack 1 and the back side of the bag-shaped second backpack 2 is positioned and attached so that it is approximately flush with the back surface 11b of the first backpack 1.

[0097] Here, as shown in Figures 8(c), 11(a), and 11(b), the second storage section 21 is attached to the first storage section 11 using the buckles 115, 117, 215, and 217 provided on the first storage section 11 and the second storage section 21, as described below. Here, a case will be described in which the pair of male buckle 115 and female buckle 215 and the pair of female buckle 117 and male buckle 217 each constitute a side release buckle, but these may be buckles other than side release buckles. In addition, which buckles are the male buckle and which are the female buckle is not limited to the above.

[0098] As shown in Fig. 11(a), two buckles 115 are attached to the left and right sides of the upper part of the front part 11a of the first storage part 11. The rear ends of the buckles 115 are attached to the first storage part 11 via a belt so that the front ends, which are used to connect the buckles together, are movable. The same applies to the buckle 117. However, the connection method of the rear ends is not limited to the above.

[0099] 8(c), two buckles 215 are attached to the left and right sides of the bottom surface of the second storage section 21 near the front side. The rear ends of the buckles 215 are attached to the second storage section 21 via a belt or the like so that the front ends, which are used to connect the buckles together, are movable. The same applies to the buckle 217. However, the connection method of the rear ends is not limited to the above.

[0100] The left and right buckles 115 and the left and right buckles 215 are attached so that when the folded second rucksack 2 is placed on the first storage section 11 so that the top surface of the first storage section 11 and the bottom surface of the second rucksack 2 are approximately aligned, the left and right positions are aligned and the left and right buckles 115 can be connected to the left and right buckles 215 without sagging.

[0101] The second storage section 21 is provided with a cover member 216 on the back side. The cover member 216 covers two buckles 217 attached to the left and right sides of the back side of the second storage section 21, and has openings on the bottom side for using the two buckles 217. Note that instead of the cover member 216, a pocket or the like may be provided.

[0102] Additionally, two buckles 117 are attached to the left and right near the rear side of the top surface of first storage section 11. The left and right buckles 117 and the left and right buckles 217 are attached so that when the folded second rucksack 2 is placed on first storage section 11 so that the top surface of first storage section 11 and the bottom surface of second rucksack 2 are roughly aligned, the left and right positions of the buckles 117 and 217 are aligned and the left and right buckles 117 can be connected to the left and right buckles 217 without sagging.

[0103] When attaching second backpack 2, which has been folded into a bag shape, to first backpack 1, second backpack 2, which has been folded into a bag shape, is placed on top of first backpack 1, and left buckle 215 is detachably connected to left buckle 115 of first backpack 1, and right buckle 215 is detachably connected to left buckle 115. Furthermore, left buckle 217, which is located in the portion of second backpack 2 covered by cover member 216, is detachably connected to left buckle 117 of first backpack 1, and right buckle 217, which is located in the portion of second backpack 2 covered by cover member 216, is detachably connected to right buckle 117 of first backpack 1. As a result, the second rucksack 2 folded into a bag shape is detachably fixed to the top of the first storage section 11.

[0104] The number of buckles used to attach the folded second backpack 2 to the first backpack 1 is not limited to the above number, as long as sufficient fastening strength can be maintained. Furthermore, the method of attaching the folded second backpack 2 to the first backpack 1 is not limited to using buckles. For example, attachment may be made with attachment devices other than buckles, such as buttons, zippers, or hook-and-loop fasteners, or buckles may be used in combination with other attachment devices. Furthermore, the shape and structure of pockets, covers, etc. for storing buckles, etc. are not limited to those described above, and pockets, covers, etc. for storing buckles, etc. may be omitted.

[0105] The first storage section 11 of the first backpack 1 and the second storage section 21 of the second backpack 2 may be made of a material such as nylon, polyvinyl chloride, polyester, cotton, leather, or faux leather. The first storage section 11 and the second storage section 21 may be made of the same or different materials. Different materials may be used for different sections of the first storage section 11 and the second storage section 21. The upper section 211 of the second storage section 21 is preferably made of a foldable material, preferably a soft or thin material that is easy to fold. The bottom and sides of the lower section 212 of the second storage section 21 may be reinforced with polyethylene foam, foam rubber, a core, or the like, or may be made of a shape-retaining material. The surfaces of the back section 11b of the first storage section 11 and the back section 21b of the second storage section 21 may be made of a mesh material such as sponge mesh. However, the materials of the first storage section 11 and the second storage section 21 are not limited to those described above. For example, materials that can be used for ordinary backpacks can be used as the materials of the first storage section 11 and the second storage section 21.

[0106] The first shoulder belt 12 and the second shoulder belt 22 can be made of the same material as the first storage compartment 11 and the second storage compartment 21. The first shoulder belt 12 and the second shoulder belt 22 may be made of the same material or different materials. A mesh material such as a sponge mesh may be used on the inside of the first shoulder belt 12 and the second shoulder belt 22. The second shoulder belt 22 is preferably made of a foldable material, and more preferably made of a material that is easy to fold.

[0107] The size of the rucksack 1000 to which the folded second rucksack 2 is attached, excluding the first shoulder straps 12, is, for example, about 300 to 380 mm in width, about 520 to 620 mm in height, and 200 to 280 mm in depth.

[0108] The size of the first rucksack 1 excluding the first shoulder straps 12 is, for example, 300 to 380 mm in width, approximately 420 to 480 mm in height, and approximately 200 to 280 mm in depth.

[0109] The size of the second backpack 2 in the folded bag shape is, for example, about 300 to 380 mm in width, about 80 to 160 mm in height, and about 200 to 280 mm in depth.

[0110] The size of the second rucksack 2 in the unfolded (in other words, unfolded) state, excluding the second shoulder straps 22, is, for example, approximately 300 to 380 mm in width, approximately 440 to 520 mm in height, and approximately 200 to 280 mm in depth.

[0111] The width of the first shoulder belt 12 is, for example, 60 to 100 mm at its thickest point and 20 to 35 mm at its thinnest point.

[0112] The width of the second shoulder belt 22 is, for example, 40 to 80 mm at its thickest point and 15 to 30 mm at its thinnest point.

[0113] However, the sizes of the backpack 1000, the first backpack 1, and the second backpack 2 are not limited to the above sizes.

[0114] Next, an example of how to use the rucksack 1000 of the present embodiment 1 will be described. Here, it is assumed that the first helmet 3a is fixed to the back side of the first lid portion 111 by the flap 113, and the second helmet 3b is stored in the auxiliary storage portion 2122 by being fixed by the flap 2131.

[0115] First, in the opposite manner to the attachment shown in Figures 11(a) and 11(b), in backpack 1000, the connections between buckles 115 and 215, and between buckles 117 and 217, which secure the second backpack 2, which has been folded into a bag shape, to the first backpack 1, are all separated, thereby releasing the connection between the second backpack 2 and the first backpack 1.

[0116] Next, the fastener 213a connecting the second lid portion 213 of the second backpack 2, which is in a folded state removed from the first backpack 1 as shown in Figure 10(a), to the lower portion 212 of the second storage portion 21 is opened, and the second lid portion 213 is opened as shown in Figure 10(b), revealing the upper portion 211 of the folded second storage portion 21 stored in the upper portion 2121 of the lower portion 212 of the second storage portion 21 as shown in Figure 10(c). The upper portion 211 of the folded second storage portion 21 stored in the lower portion 212 of the second storage portion 21 is unfolded, and the snap hooks (not shown) at the lower ends of the shoulder straps 22 are attached to D-rings (not shown) provided below the lower portion 212 of the second storage portion 21, resulting in the second backpack 2 in an unfolded state as shown in Figures 3(a) to 3(f) and 8(a).

[0117] When the zipper 212a of the second backpack 2 is opened and the opening / closing section 2126 of the auxiliary storage section 2122 is opened as shown in Figure 13(a), the retractable second helmet 3b in a contracted state secured by a pair of flaps 2131 appears, and the second helmet 3b can be removed from the second backpack 2 by undoing the connection of the flaps 2131 and removing the second helmet 3b from the back side of the second lid section 213.

[0118] Furthermore, in the unfolded second rucksack 2 with the second helmet 3b not stored in the auxiliary storage section 2122, when the fastener 212a of the second rucksack 2 is opened and the opening / closing section 2126 of the auxiliary storage section 2122 is opened, a pair of flaps 2131 attached to the upper surface 2127 inside the auxiliary storage section 2122 appears, as shown in Figure 13(b). These flaps 2131 secure the retractable second helmet 3b in place. Then, after closing the opening / closing portion 2126 and closing the zipper 212a, as shown in Figure 10(c), the upper portion 211 of the second storage portion 21 is folded and stored in the upper portion 2121 of the lower portion 212 of the second storage portion 21 together with the second shoulder strap with its lower end removed, and the second lid portion 213 is closed.As shown in Figure 10(b), by closing the zipper 213a, the second backpack 2 takes on the shape of a bag, as shown in Figure 10(a).

[0119] 11(a) and 11(b), the second backpack 2, which has been folded into a bag shape, is placed on top of the first backpack 1, and the left and right buckles 215 are detachably connected to the left and right buckles 115 of the first backpack 1, and similarly the left and right buckles 217 are detachably connected to the left and right buckles 117. As a result, the second backpack 2, which has been folded into a bag shape, is detachably attached to the top of the first storage section 11, as shown in FIGS. 1(a) to 1(f).

[0120] 12(a), when the opening / closing section 2126 of the folded second backpack 2 is opened, the retractable second helmet 3b secured by a pair of flaps 2131 appears, and the second helmet 3b can be removed by undoing the connection between the flaps 2131 and removing it from the upper surface 2127 inside the auxiliary storage section 2122, thereby removing it from the second backpack 2. After removing the second helmet 3b, the flaps 2131 are secured together with hook-and-loop fasteners 2131b in an overlapping state, for example, as shown in FIG.

[0121] When the folded second backpack 2 is attached to the top of the first storage section 11, as described above, by opening the opening / closing section 2126, the retractable second helmet 3b in a contracted state secured by a pair of flaps 2131 is revealed, and by undoing the connection of the flaps 2131, the second helmet 3b can be removed from the second backpack 2.

[0122] Furthermore, as shown in FIG. 9(a), when the fastener 111a of the first backpack 1 is opened and the first cover 111 is opened, the retractable first helmet 3a secured by a pair of flaps 113 appears in a contracted state. The first helmet 3a can then be removed from the first backpack 1 by undoing the connection between the flaps 113 and removing the first helmet 3a from the back side of the first cover 111. After removing the first helmet 3a, the flaps 113 are secured together with hook-and-loop fasteners 2131b, for example, as shown in FIG. 9(b). The same applies when the folded second backpack 2 is attached to the top of the first storage section 11.

[0123] Furthermore, when the first helmet 3a is not stored on the back side of the first lid portion 111, opening the fastener 111a of the first rucksack 1 to open the first lid portion 111 reveals a pair of overlapping and connected flaps 113, and as shown in Fig. 9(c), by undoing the connection of these flaps 113 and placing the first helmet 3a on the back side of the first lid portion 111 as shown in Fig. 9(a), and arranging the pair of flaps 113 to cover the first helmet 3a and connecting the flaps 113 together, the retractable first helmet 3a can be fixed to the back side of the first lid portion 111. The same applies when the folded second rucksack 2 is attached to the top of the first storage section 11.

[0124] As described above, according to the backpack 1000 of this embodiment, by removing and unfolding the folded second backpack 2, luggage can be stored and carried in the second backpack 2, so that luggage can be dispersed and carried when necessary.

[0125] Furthermore, since luggage can be distributed between the first backpack and the second backpack, users of either backpack can enjoy the ease of carrying luggage and the convenience of not having their hands full with luggage.

[0126] Furthermore, according to this embodiment, the first helmet 3a is removably fixed to the back side of the first lid portion 111 of the first backpack 1 by the fixing device 2124, so that the first helmet 3a can be easily removed by opening the first lid portion 111.

[0127] Furthermore, a pair of flaps 113 equipped with hook-and-loop fasteners 113b are used as fasteners for removably fastening the first helmet 3a, making it easy to fasten and remove the first helmet 3a, and particularly in an emergency, the first helmet 3a can be easily removed from the flaps 113.

[0128] Furthermore, by using a modified helmet that has been modified to be smaller as the first helmet 3a, the volume required to store the first helmet 3a can be reduced, and the rucksack 1000 can be prevented from becoming larger.

[0129] Furthermore, according to this embodiment, the second helmet 3b can be stored in the auxiliary storage section 2122 of the second rucksack 2 when it is folded and attached to the first rucksack 1, so even when the second rucksack 2 is removed from the first rucksack 1, the second helmet 3b remains stored in the second rucksack 2 without the need for repacking or the like, making it possible to prevent the second helmet 3b from being forgotten when removing the second rucksack 2 and moving around. For example, when the second rucksack 2 is removed from the first rucksack 1 and used during an evacuation, it is possible to prevent the second helmet 3b from being forgotten, ensuring safety.

[0130] Furthermore, because the second helmet 3b can be stored in the auxiliary storage section 2122 that is separated from the upper section 211 of the second storage section 21 and the upper section 2121 of the lower section 212, the second helmet 3b can be easily removed from the opening / closing part 2126 without having to temporarily remove or push aside other luggage stored in the second storage section 21. Furthermore, the second helmet 3b can be easily removed from the opening / closing part 2126 whether the second rucksack 2 is folded into a bag shape or in an unfolded state. This allows the second helmet 3b to be quickly removed, for example, in an emergency.

[0131] Furthermore, by storing the second helmet 3b in the auxiliary storage section 2122 so that its height direction is the same as that of the second rucksack 2, the second helmet 3b can be stably positioned at the bottom side of the second rucksack 2 and the left and right balance of the second rucksack 2 can be maintained.

[0132] Furthermore, since the second helmet 3b can be fixed to the auxiliary storage section 2122 with a fixing device, it is possible to prevent the second helmet 3b from falling out of the auxiliary storage section 2122 if the opening / closing section 2126 is forgotten to be closed or if the opening / closing section 2126 is opened by mistake.

[0133] In addition, a pair of flaps 2131 equipped with hook-and-loop fasteners are used as fastening devices for fixing the second helmet 3b, so that the second helmet 3b can be easily fixed and removed, and particularly in an emergency, the second helmet 3b can be easily removed from the second backpack 2.

[0134] Furthermore, by storing a modified helmet that has been deformed into a smaller size as the second helmet 3b in the auxiliary storage section 2122, the size of the auxiliary storage section 2122 required to store the second helmet 3b can be reduced, ensuring a large capacity for storing luggage other than the second helmet 3b in the second rucksack 2. Furthermore, the size of the second rucksack 2 in a folded state can be reduced, preventing the rucksack 1000 to which it is attached from becoming larger.

[0135] In this embodiment, the case where the luggage stored in the auxiliary storage section 2122 is mainly the second helmet 3b has been described, but the luggage stored in the auxiliary storage section 2122 is not limited to a helmet.

[0136] In the above embodiment, the second rucksack 2 has been described as having an auxiliary storage section 2122. However, if the auxiliary storage section 2122 is not required, such as when there is no need to store the second helmet 3b, the auxiliary storage section 2122 of the second rucksack 2 may be omitted. In this case, for example, the opening and closing section 2126 and fasteners provided within the auxiliary storage section 2122 may also be omitted. The second rucksack 2 may also be used as an independent foldable rucksack, in which case the buckles 215, 217, cover member 216, etc. used to attach the folded second rucksack to the first rucksack may be omitted.

[0137] The present invention is not limited to the above-described embodiment, and various modifications are possible, and it goes without saying that these modifications are also included within the scope of the present invention. [Industrial Applicability]

[0138] As described above, the backpack etc. according to the present invention is suitable as a backpack etc. for storing luggage, and is particularly useful as a backpack etc. for storing luggage including a helmet. [Explanation of symbols]

[0139] 1. First Backpack 2. Second Backpack 11 First storage area 3a First Helmet 3b Second Helmet 11 First storage section 11a, 21a Front section 11b, 21b Rear part 12 First shoulder strap 13, 23 Handle 21 Second storage area 22 Second shoulder strap 111, 213 First lid 113, 2131 flaps 113b, 2131b hook-and-loop fastener 120 Side Pocket 211 Upper 212 Lower 21d Right side 21e left side 213 Second Lid 216 Cover member 1000 Backpack 2122 Auxiliary storage section 2124 Fixtures 2126 Opening and closing section

Claims

1. a first backpack having a first storage compartment for storing luggage and a pair of first shoulder straps attached to a back surface of the first storage compartment; a foldable backpack comprising a second storage section for storing luggage, and a pair of second shoulder straps attached to a back surface of the second storage section, the second backpack being detachably attached to the first storage section in a folded state; the first storage section has a first lid section near an upper portion that can be opened and closed to put in and take out items to be stored in the first storage section, The backpack has a first fastener for removably fastening a first helmet provided on the back side of the first lid portion.

2. 2. The backpack according to claim 1, wherein the first helmet is removably fixed to the inside of the first lid portion by the first fixing device.

3. 3. A backpack according to claim 1, wherein the first helmet fixed by the first fixing device is a deformed helmet in a compact state.

4. a first backpack having a first storage compartment for storing luggage and a pair of first shoulder straps attached to a back surface of the first storage compartment; a foldable backpack comprising a second storage section for storing luggage, and a pair of second shoulder straps attached to a back surface of the second storage section, the second backpack being detachably attached to the first storage section in a folded state; When the second backpack is folded, an upper part of the folded second storage section and the second shoulder straps are stored in a lower part of the second storage section, The backpack has a second lid attached to a portion of the lower part of the second storage section that becomes the upper end when folded, and the second lid can be opened and closed at the upper end.

5. the first storage section has a first lid section near an upper portion that can be opened and closed to put in and take out items to be stored in the first storage section, 5. The backpack according to claim 4, wherein a first fastener for removably fastening the first helmet is provided on the back side of the first lid portion.

6. 6. The backpack according to claim 5, wherein the first helmet is removably fixed to the inside of the first lid portion by the first fixing device.

7. 7. A backpack according to claim 5, wherein the first helmet fixed by the first fixing device is a modified helmet that has been deformed into a small size.

8. an auxiliary storage section partitioned from an upper side of the lower part of the second storage section is provided on the bottom side of the lower part of the second storage section, An opening / closing section that can be opened and closed is provided on a side surface of the auxiliary storage section for putting in and taking out luggage stored in the auxiliary storage section, A backpack as claimed in any one of claims 4 to 7, wherein the upper part of the second storage section and the second shoulder straps of the second backpack are stored in the lower part of the second storage section, above the auxiliary storage section, when folded.

9. 9. The backpack according to claim 8, wherein the auxiliary storage compartment has a size capable of storing a second helmet.

10. 10. The backpack according to claim 9, wherein a second fastener for removably fastening a second helmet is provided on the inner upper or lower surface of the auxiliary storage section.

11. 11. A backpack according to claim 9 or 10, wherein the second helmet is stored in the auxiliary storage section.

12. 12. The backpack according to claim 9, wherein the second helmet stored in the auxiliary storage section is a modified helmet that has been deformed into a small size.

13. 13. A backpack according to any one of claims 1 to 12, wherein the second backpack is attached to an upper portion of the first storage section.

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