backpack

Abstract

This invention provides a backpack that reduces swaying when all shoulder straps are worn across both shoulders, and maintains aesthetics and ease of use even when only a single shoulder strap is worn across one shoulder. The backpack 1 includes: a first shoulder strap 3 worn across one shoulder; a second shoulder strap 4 worn across the other shoulder; and a main compartment 2. The first shoulder strap 3 and the second shoulder strap 4 are independent of each other. One end of the first shoulder strap 3 is detachably attached to the upper side of the main compartment 2, and the other end is detachably attached to the lower side of the main compartment 2. One end of the second shoulder strap 4 is detachably attached to the upper side of the main compartment 2, and the other end is detachably attached to the lower side of the main compartment 2.

Description

[Technical Field]

[0001] The present invention relates to a backpack comprising: a first shoulder strap that crosses one shoulder; a second shoulder strap that crosses the other shoulder; and a main pocket. [Previous Technology]

[0002] Previously, it was known to attach the first shoulder strap and the second shoulder strap to the main compartment of a backpack in such a way that the first shoulder strap, which crosses over one shoulder, and the second shoulder strap, which crosses over the other shoulder, cross at the user's back (for example, see Patent Document 1). According to the backpack of Patent Document 1, since the first shoulder strap and the second shoulder strap cross at the user's back, the swaying of the backpack when walking or running with the first shoulder strap and the second shoulder strap crossed over the shoulders can be reduced.

[0003] [Prior Art Documents] [Patent Documents] Patent Document 1: Japanese Patent Application Publication No. 2005-279025 [Summary of the Invention]

[0004] [Problem to be Solved by the Invention] Furthermore, when it is necessary to immediately retrieve items from a backpack, or when it is cumbersome to wear both shoulder straps, there are situations where only one shoulder strap is worn instead of both the first and second shoulder straps. In the backpack described in Patent Document 1, when only one shoulder strap is worn, the other shoulder strap droops, which detracts from the appearance, and there is also a risk that the drooping shoulder strap may snag on nearby objects or handrails during walking or running.

[0005] In view of the above situation, the present invention aims to provide a backpack that reduces the swaying of the backpack when each shoulder strap is crossed over both shoulders, and is convenient to use without compromising aesthetics when only a single shoulder strap is crossed over the shoulder.

[0006] [Technical Means for Solving the Problem] The backpack of the present invention, which solves the above-mentioned objective, comprises: a first shoulder strap that crosses one shoulder; a second shoulder strap that crosses the other shoulder; and a main pocket; and is characterized in that: the aforementioned first shoulder strap and the aforementioned second shoulder strap are independent of each other; one end of the aforementioned first shoulder strap is detachably mounted to the upper part of the aforementioned main pocket on the aforementioned other side, and the other end is detachably mounted to the lower part of the aforementioned main pocket on the aforementioned other side; one end of the aforementioned second shoulder strap is detachably mounted to the upper part of the aforementioned main pocket on the aforementioned other side, and the other end is detachably mounted to the lower part of the aforementioned main pocket on the aforementioned other side.

[0007] According to this backpack, the swaying of the backpack can be reduced when walking or running with the first and second shoulder straps crossed over the shoulders respectively. Furthermore, since the other shoulder strap can be removed from the main compartment when only one shoulder strap is crossed over the shoulder, it can be used without compromising aesthetics, and there is no risk of the other shoulder strap getting caught on nearby objects or handrails.

[0008] In this backpack, it is feasible that the first shoulder strap has one end that can be repositioned on the other side above the main bag, and the second shoulder strap has one end that can be repositioned on the other side above the main bag.

[0009] Since the first shoulder strap and the second shoulder strap mentioned above are designed to have one end that can be changed, they can be adjusted according to the user’s physique in a way that prevents the shoulder straps from shifting or slipping off and does not constrict the user’s neck.

[0010] Here, it is feasible that one end of the aforementioned first shoulder strap can be installed in a left-right direction on the other side of the aforementioned upper part of the main bag, and one end of the aforementioned second shoulder strap can be installed in a left-right direction on the other side of the aforementioned upper part of the main bag. Furthermore, it is feasible that one end of the aforementioned first shoulder strap can be installed in a vertical direction on the other side of the aforementioned upper part of the main bag, and one end of the aforementioned second shoulder strap can be installed in a vertical direction on the other side of the aforementioned upper part of the main bag.

[0011] Furthermore, the backpack may have a strap, the two ends of which are held in place of one of the aforementioned first shoulder strap and the aforementioned second shoulder strap, and extend along the length of the aforementioned shoulder strap with a gap between the two ends and the aforementioned first shoulder strap and the aforementioned second shoulder strap, the other shoulder strap passing through the aforementioned gap.

[0012] Because the crossing position of the aforementioned first shoulder strap and the aforementioned second shoulder strap is determined to some extent by the aforementioned strap portion, it is easy to clearly define how to carry the backpack in a manner where the crossing position of the first shoulder strap and the aforementioned second shoulder strap is located behind the neck. Furthermore, because the crossing position of the aforementioned first shoulder strap and the aforementioned second shoulder strap can vary according to the user's physique, such as the thickness of the neck or the width of the shoulders, it can reduce pressure or burden on the user. In addition, because the crossing position can be varied, compared to fixing the crossing part, it can reduce fatigue for the user carrying the backpack.

[0013] Here, the aforementioned strap portion may be disposed on one end portion of the aforementioned shoulder strap. Alternatively, the aforementioned strap portion may form the aforementioned gap on one end portion of the aforementioned shoulder strap.

[0014] [Effects of the Invention] According to the present invention, a backpack can be provided that reduces the swaying of the backpack when each shoulder strap is crossed over both shoulders, and is convenient to use without compromising aesthetics when only a single shoulder strap is crossed over the shoulder.

Implementation Method

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0017] Figure 1 is a front view of the backpack corresponding to one embodiment of the present invention, viewed from the side with the shoulder straps. Figure 2 is a rear view of the backpack shown in Figure 1. The backpack 1 can also be used in an inclined position relative to the posture shown in Figure 1, or in a horizontal position; however, in the following description, the backpack 1 will be described based on the vertical direction of the backpack 1 in the posture shown in Figure 1. Furthermore, the side closest to the front in Figure 1 may be referred to as the front, and the side opposite to it as the back.

[0018] As shown in Figure 1, in this embodiment, the backpack 1 has: a main compartment 2, a first shoulder strap 3, a second shoulder strap 4, and a strap portion 5. The main compartment 2 has: a main compartment body 21, an upper mounting portion 22, a lower mounting portion 23, a side pocket 24, and a back pocket 25 (see Figure 2). The main compartment body 21 is a bag-shaped structure with an internal storage space for storing items and an opening (not shown) at the top for taking out and putting in items. The opening is opened and closed freely by a zipper.

[0019] There are six upper mounting portions 22 on the upper front of the main bag body 21, three on each side. Of these six upper mounting portions 22, the upper mounting portion 22 on the left side in Figure 1 is for mounting the first shoulder strap 3, and the upper mounting portion 22 on the right side in Figure 1 is for mounting the second shoulder strap 4. Hereinafter, the right side of the backpack 1 in Figure 1 will be referred to as one side, and the left side in Figure 1 will be referred to as the other side. The upper mounting portions 22 are made of a generally rectangular piece of fabric with its upper and lower ends sewn to the main bag body 21. The sewn ends of the upper mounting portions 22 are slightly separated from the main bag body 21.

[0020] There are two lower mounting parts 23, one on each of the left and right ends of the lower front part of the main bag body 21. The lower mounting parts 23 are attached to the front part of the triangular fabric of the main bag body 21, which is sewn to one side and has a D-shaped metal piece attached thereto.

[0021] Side pockets 24 are formed on one end and the other end of the front of the main pocket 2. The side pockets 24 are slightly smaller pockets used to hold smaller items. The openings 241 of the side pockets 24 extend vertically. The openings 241 are opened and closed freely by means of a zipper.

[0022] As shown in Figure 2, a back pocket 25 is provided on the back of the main pocket 2. The back pocket 25 is a pocket that protrudes towards the back of the main pocket body 21. The back pocket 25 has an opening (not shown) on its upper part, which can be opened and closed freely by a zipper.

[0023] As shown in Figure 1, the first shoulder strap 3 is a strap-shaped structure in which one end is detachably attached to any one of the three upper mounting portions 22 located on the other side of the main pocket 2, and the other end is detachably attached to the lower mounting portion 23 located on one side of the main pocket 2. Figure 1 shows an example where one end of the first shoulder strap 3 is attached to the central upper mounting portion 22 of the three upper mounting portions 22 located on the other side. The first shoulder strap 3 has a first length adjustment member 31 on its lower part, which can be adjusted for appropriate length.

[0024] A first fastener 32 is provided at one end of the first shoulder strap 3. The first fastener 32 has: a hook, which is U-shaped; and a latch for closing the open end of the U-shape. The latch is flexible and its state changes from closed to open by swinging. The first fastener 32 is installed on the main pocket 2 by inserting the upper part of the hook between the upper mounting part 22 and the main pocket body 21 and closing the latch. Furthermore, by pinching the open end of the hook of the first fastener 32 to bend it, and swinging the latch to open the open end of the hook, inserting the upper part of the hook between the other upper mounting part 22 and the main pocket body 21 and closing the latch, the installation position of one end of the first shoulder strap 3 can be changed. A buckle (not shown) is provided at the other end of the first shoulder strap 3. By hooking the buckle to the D-shaped metal part of the mounting part 23 on one side, the other end of the first shoulder strap 3 can be easily attached to the main pocket 2.

[0025] The second shoulder strap 4 has the same configuration as the first shoulder strap 3. The first shoulder strap 3 and the second shoulder strap 4 are independent of each other, except that their intersection positions are determined to some extent by the strap portion 5. The second shoulder strap 4 has one end detachably mounted to any of the three upper mounting portions 22 located on one side of the main pocket 2, and the other end detachably mounted to the lower mounting portion 23 located on the other side of the main pocket 2. Figure 1 shows an example where one end of the second shoulder strap 4 is mounted to the central upper mounting portion 22 of the three upper mounting portions 22 located on one side. The second shoulder strap 4 has a second length adjustment member 41 on its lower portion, allowing for appropriate length adjustment.

[0026] A second fastener 42 is provided at one end of the second shoulder strap 4. Since the second fastener 42 has the same structure as the first fastener 32, detailed description is omitted. Similar to the first fastener 32, the mounting position of one end of the second shoulder strap 4 can be changed to any of the upper mounting portions 22 via the second fastener 42. A buckle (not shown) is provided at the other end of the second shoulder strap 4. By hooking this buckle to the D-shaped metal piece of the lower mounting portion 23 on the other side, the other end of the second shoulder strap 4 can be easily attached and detached from the main pocket 2.

[0027] The strap portion 5 is made of a long strip of fabric disposed on one end of the second shoulder strap 4. The two ends of the strap portion 5 are fixed to the second shoulder strap 4 by sewing them together. The strap portion 5 is slightly separated from the second shoulder strap 4 except for the two ends. That is, the strap portion 5 extends along the second shoulder strap with a gap between its two ends and the second shoulder strap 4. When the first shoulder strap 3 and the second shoulder strap 4 are installed in the main pocket 2 as shown in FIG1, the first shoulder strap 3 passes through the gap formed between the second shoulder strap 4 and the strap portion 5. The strap portion 5 limits the crossing position of the first shoulder strap 3 and the second shoulder strap 4 to one end of the second shoulder strap 4. In this way, it is easy to understand the relationship between the crossing position and the position of the user U's (see FIG3) head or the position where the arm passes through. That is, the crossing point is behind the user U's neck. By simply observing the backpack 1, it is clear that the arm can be passed through the first shoulder strap 3 and the second shoulder strap 4 just below the crossing point. Furthermore, even if the crossing part of the first shoulder strap 3 and the second shoulder strap 4 is sewn and fixed, the position of the crossing point and the user U's head or arm can still be easily identified. However, if the crossing part is sewn, the two shoulder straps become one, thus reducing the freedom of movement of the shoulder straps and narrowing the range of applicability to the user U's physique. There is also a possibility that the burden on the user U will increase depending on the user U's movements. Also, if the crossing part is sewn, as will be described later, when only one of the first shoulder straps 3 and the second shoulder strap 4 is to be used, it will become a situation where another shoulder strap is installed on the single shoulder strap being used.

[0028] Figure 3 is a front view showing the state of the backpack as shown in Figure 1 after the user is carrying it. Figure 4 is a rear view showing the state of the backpack as shown in Figure 1 after the user is carrying it.

[0029] As shown in Figures 3 and 4, when user U is carrying backpack 1, the first shoulder strap 3 crosses one shoulder of user U, and the second shoulder strap 4 crosses the other shoulder of user U. Furthermore, the first shoulder strap 3 and the second shoulder strap 4 cross slightly below the neck on the back side of user U. This makes backpack 1 less prone to swaying or moving in the left-right direction, and easily maintains a close fit against user U's back, thus reducing swaying of backpack 1 when user U is walking or running. Also, since the first shoulder strap 3 only passes between the second shoulder strap 4 and the strap 5, the first shoulder strap 3 and the second shoulder strap 4 do not obstruct each other's movement in the up, down, left, or right directions. Therefore, the crossing position of the first shoulder strap 3 and the second shoulder strap 4 can vary depending on the user U's physique, such as neck thickness or shoulder width, and becomes the most stable crossing position when carrying the backpack, thus reducing pressure on user U. Furthermore, since the first shoulder strap 3 and the second shoulder strap 4 correspond to the user U’s movements or postures and thus achieve the most stable posture, the user U carrying the backpack 1 can reduce fatigue compared to fixing the cross-section.

[0030] As explained so far, one end of each of the first shoulder strap 3 and the second shoulder strap 4 is detachably attached to the main pocket 2. Therefore, it is possible to configure the main pocket 2 to have only one of the first shoulder strap 3 and the second shoulder strap 4 attached.

[0031] Figure 5 is a front view showing the backpack after the second shoulder strap has been removed, which is the same as in Figure 1.

[0032] As shown in Figure 5, the second shoulder strap 4 of the backpack 1 is removed from the main pocket 2, and only the first shoulder strap 3 is attached to the main pocket 2. When it is cumbersome for the user U to wear the first shoulder strap 3 and the second shoulder strap 4 on both shoulders, or when the user U wants to immediately retrieve items from the backpack 1, the backpack 1 can be used with only one shoulder strap attached to the main pocket 2. In this state, the user U can use the backpack 1 as a so-called crossbody bag. Furthermore, as shown in Figure 5 with the second shoulder strap 4 removed and the first shoulder strap 3 attached, the backpack 1 can also be used with the first shoulder strap 3 removed and the second shoulder strap 4 attached.

[0033] Figure 6 is a front view showing the user carrying the backpack shown in Figure 5 with the second shoulder strap removed. Figure 7 is a rear view showing the user carrying the backpack shown in Figure 5 with the second shoulder strap removed.

[0034] As shown in Figures 6 and 7, when using the first shoulder strap 3 and the user U is carrying the backpack 1, the first shoulder strap 3 is crossed over the user U's other shoulder. The first shoulder strap 3 is diagonally crossed over the user U's body, and the main bag 2 is in a slightly tilted position on the user U's back side. As shown in Figures 6 and 7, by using only one shoulder strap from the first shoulder strap 3 and the second shoulder strap 4, the user U can move the main bag 2, located on the back side, to the front side (chest side) of the body while maintaining the position of crossing the shoulder with only one shoulder strap. Moreover, by moving the main bag 2 to the front side of the body, items located inside the main bag body 21 can be easily retrieved.

[0035] Figure 8 is a front view showing the state from which the main bag has been moved to the front side of the body, as shown in Figure 6.

[0036] As shown in Figure 8, when the main bag 2 is moved to the side in front of the user U, the main bag 2 is rotated approximately 90 degrees relative to the positions shown in Figures 1 and 2, with an axis orthogonal to the plane of the paper as the axis of rotation. In this position shown in Figure 8, since the opening 241 of the side bag 24 is in a generally horizontal direction, it is particularly easy to take out items from the upper side bag 24. Furthermore, by further moving the main bag 2 to the left side in Figure 8 from the position shown in Figure 8, it is also easier to take out items located inside the main bag body 21 from the opening located above the main bag body 21.

[0037] As described above, the backpack 1 can be detached when only one of the shoulder straps, the first shoulder strap 3 and the second shoulder strap 4, is used. This allows for aesthetically pleasing use when only one shoulder strap is used, and prevents the other shoulder strap from snagging on nearby objects or handrails. Furthermore, since the mounting position of one end of each of the first shoulder strap 3 and the second shoulder strap 4 can be changed, the mounting position of one end can be adjusted according to the user U's physique, such as neck thickness or shoulder width. For example, if the user U has a thick neck, by mounting one end of the first shoulder strap 3 to the innermost upper mounting part 22 on the other side, and mounting one end of the second shoulder strap 4 to the innermost upper mounting part 22 on one side, the tightness on the user U's neck can be reduced. Conversely, when the user U has a thin neck and narrow shoulders, by attaching one end of the first shoulder strap 3 to the outermost upper part of the mounting part 22 on the other side and attaching one end of the second shoulder strap 4 to the outermost upper part of the mounting part 22 on one side, the position or posture of the main bag 2 is more stable, and the shoulder straps are less likely to slip off the user U's shoulder.

[0038] Next, variations of this embodiment will be explained. In the following explanation, there are cases where the same symbols as those used so far are assigned to the names of constituent elements that have the same names as those of the constituent elements explained so far, and there are cases where repeated explanations are omitted.

[0039] Figure 9 shows the backpack after the first variation example, which is the same as that in Figure 1.

[0040] In the aforementioned embodiment of the backpack 1, the first shoulder strap 3 has one end that can be mounted in a generally left-right direction on the other side of the upper part of the main compartment 2, and the second shoulder strap 4 has one end that can be mounted in a generally left-right direction on one side of the upper part of the main compartment 2. In contrast, in the first variation of the backpack 1, as shown in FIG9, the mounting position of one end of each of the first shoulder strap 3 and the second shoulder strap 4 can also be changed in the up-down direction. The upper mounting portion 22 is arranged in a matrix of 2 columns and 3 rows on one side and the other side of the main compartment 2, respectively. Moreover, one end of the first shoulder strap 3 can be mounted in both a generally left-right direction and a generally up-down direction on the other side of the upper part of the main compartment 2. Similarly, one end of the second shoulder strap 4 can be mounted in both a generally left-right direction and a generally up-down direction on one side of the upper part of the main compartment 2.

[0041] In this first variation, the same effect as the previous embodiment is achieved. Moreover, since the mounting position of one end of each of the first shoulder strap 3 and the second shoulder strap 4 can be changed in the vertical direction, the mounting position of one end can be changed more flexibly according to the user U's physique, etc.

[0042] Figure 10 is a rear view of the backpack of the second variation, identical to that in Figure 1. In Figure 10, the first shoulder strap 3 and the second shoulder strap 4 are shown with the main pocket 2 removed, making it easy to understand the difference from the previously described embodiment. Furthermore, the first shoulder strap 3 and the second shoulder strap 4 of this second variation backpack 1 can be arbitrarily attached and detached. Therefore, as shown in Figure 1 or Figure 5, the backpack 1 can be configured with one or both of the first shoulder strap 3 and the second shoulder strap 4 attached.

[0043] As shown in Figure 10, the second variation of the backpack 1 differs from the previous embodiment in that a zipper 26 is provided on the main body 21 to replace the two side pockets 24. The zipper 26 has two sliders 261. That is, the zipper 26 is a so-called W-shaped fastener. The zipper 26 extends rectangularly on the front of the main body 21 with R-shaped marks at the corners. Therefore, the two sliders 261 can move at any position along the top, bottom, left, and right sides of the rectangle. Figure 10 shows the zipper 26 in the closed state. A rectangular cover 211 with R-shaped marks at the corners is provided inside the zipper 26. By sliding one or both of the two sliders 261, the cover 211 is opened, forming a front opening 212 connected to the interior of the main body 21 (see Figure 11). Items stored inside the main body 21 can be taken out through the front opening 212.

[0044] Furthermore, a plate-like member is disposed on the inner side of the portion constituting the front of the backpack (hereinafter referred to as the front section). The plate-like member is made of resin board, or it may be plywood, wood board, or metal board. This plate-like member is an example of a planar state maintaining member. The plate-like member is disposed as a whole of the front section. However, the plate-like member may also be disposed only as a whole of the cover 211 or in the central part of the cover 211. By disposing of the plate-like member on the inner side, the portion of the backpack on the front section for placing items is less prone to bending, and it is easy to maintain a planar state when items are placed on this portion. In this way, items placed on this portion are stable.

[0045] Figure 11 is a perspective view showing the appearance of the backpack lid after it is opened as shown in Figure 10.

[0046] As shown in Figure 11, by moving the main bag 2 from the position of carrying the backpack 1 to the front of the body and making the front of the main bag 2 face upwards, the user U can slide the slider 261 (see Figure 10) and open the cover 211. By making the front of the main bag 2 face upwards, the user U can easily operate the slider 261 and easily take out large items from inside the main bag body 21. Furthermore, even if the front of the main bag 2 is slightly more facing the user U's abdomen than the top, the user U can still operate the slider 261 to easily take out items from inside the main bag body 21. Since the two sliders 261 can move to any position among the top, bottom, left, and right sides of the cover 211 as described above, when moving the main bag 2 to the front of the body, the two sliders 261 can be pre-positioned in a position that is easy for the user U to operate. In this way, the user U can operate the sliders 261 more easily. Furthermore, because the cover 211 is not easily bent due to its plate-like structure, it can be easily opened and closed. By opening the cover 211, a front opening 212 is formed that connects to the interior of the main compartment 21. Moreover, as shown in Figure 11, the backpack 1 is in the same state after the second shoulder strap 4 is installed, and the same applies when the first shoulder strap 3 is installed, allowing large items to be easily removed from the interior of the main compartment 21.

[0047] Figure 12 is a perspective view showing the state after the contents of the main compartment of the backpack have been removed from the interior, the lid has been closed, and the removed contents have been placed on the main compartment. Figure 12(a) shows an example of an item, namely a laptop computer N, placed on the main compartment 21. Also, Figure 12(b) shows an example of an item, namely a piece of paper P, placed on the main compartment 21.

[0048] As shown in Figure 12, by placing items taken out of the main bag body 21 onto the main bag body 21 with the closed cover 211, the main bag 2 can be used as a shelf without removing the first shoulder strap 3. For example, as shown in Figure 12(a), by placing a laptop N on the main bag body 21, the user U can type while standing. Also, as shown in Figure 12(b), by placing a piece of paper P on the main bag body 21, the user U can use the backpack 1 like a drawing board to write pictures or text on the paper P. Furthermore, by using the backpack 1 as shown in Figure 12, in addition to the laptop N or the paper P, any item can be placed on the main bag body 21 for operation or work. Also, Figure 12 shows the backpack 1 with the first shoulder strap 3 installed, but the same applies when the second shoulder strap 4 is installed; the main bag 2 can be used as a shelf.

[0049] In this second variation, the same effect as the previous embodiment is achieved. Furthermore, because the cover 211 is provided, the user U can easily retrieve large items located inside the main bag body 21. Moreover, by placing the main bag body 21 in front of the user U, items can be retrieved from the main bag body 21 without removing the first shoulder strap 3 or the second shoulder strap 4. Furthermore, by placing the main bag body 21 in front of the user U with its front facing upwards, the main bag 2 can be used as a shelf. At this time, because a plate-like member is provided on the front of the backpack, the portion where items are placed is less prone to bending, thus making the placed items more stable.

[0050] The following inventive ideas can be extracted from the second variation example after the knapsack 1.

[0051] A backpack having a shoulder strap that spans one shoulder and a main pocket, characterized in that: the main pocket is provided with a planar state maintaining member on the front of the user side when the backpack is carried.

[0052] Furthermore, the following inventive ideas can be extracted from the backpack 1 after the second variation example.

[0053] A backpack comprising: a first shoulder strap across one shoulder; a second shoulder strap across the other shoulder; and a main pocket; and characterized in that: the first shoulder strap and the second shoulder strap are independent of each other; one end of the first shoulder strap is detachably mounted to the upper part of the main pocket on the aforementioned other side, and the other end is detachably mounted to the lower part of the main pocket on the aforementioned other side; one end of the second shoulder strap is detachably mounted to the upper part of the main pocket on the aforementioned other side, and the other end is detachably mounted to the lower part of the main pocket on the aforementioned other side; and the main pocket, when carried, has a planarity maintenance member on the front of the user side for maintaining a planar state.

[0054] The backpack may include: a front opening formed on the front and connected to the interior of the main compartment; and a cover that can open and close the front opening freely.

[0055] Here, the aforementioned cover may have the aforementioned planar state maintaining member inside. The present invention is not limited to the above-described embodiments, and various variations can be made within the scope described in the claims. For example, the upper mounting portion 22 may have 1 on each side, 2 on each side, 4 to 5 on each side, or 7 or more on each side. Furthermore, in the case of 2 or more on each side, they may be arranged only in the vertical direction. Furthermore, the number on one side and the other side may be different. In addition, it may be configured such that one or both ends of the strap portion 5 are detachably held to the first shoulder strap 3 using metal fasteners or buttons. Furthermore, the strap portion 5 may be held to one end of the first shoulder strap 3 instead of being held to the second shoulder strap 4. Furthermore, it may be configured such that the strap portion 5 is disposed on both the first shoulder strap 3 and the second shoulder strap 4, and either strap portion 5 may be used selectively.

[0056] Furthermore, even if the constituent elements are only included in the various variations described above, the constituent elements can be applied to other variations. [Simplified Explanation of the Diagram]

[0015] Figure 1 is a front view of the backpack corresponding to one embodiment of the present invention, viewed from the side with the shoulder straps. Figure 2 is a rear view of the backpack shown in Figure 1. Figure 3 is a front view showing the user carrying the backpack shown in Figure 1. Figure 4 is a rear view showing the user carrying the backpack shown in Figure 1. Figure 5 is a front view showing the backpack shown in Figure 1 with the second shoulder strap removed, identical to Figure 1. Figure 6 is a front view showing the user carrying the backpack shown in Figure 5 with the second shoulder strap removed. Figure 7 is a rear view showing the user carrying the backpack shown in Figure 5 with the second shoulder strap removed. Figure 8 is a front view showing the main compartment moved to the front side of the body, as shown in Figure 6. Figure 9 is a rear view showing the backpack of the first variation, identical to Figure 1. Figure 10 is a rear view showing the backpack of the second variation, identical to Figure 1. Figure 11 is a perspective view showing the backpack with the lid of the backpack shown in Figure 10 open. Figures 12(a) and (b) are perspective views showing the state of the backpack after the items are taken out from the main compartment of the backpack as shown in Figure 10, the lid is closed, and the taken-out items are placed on the main compartment.

Claims

1. A backpack comprising: a first shoulder strap crossing one shoulder; a second shoulder strap crossing the other shoulder; and a main compartment; characterized in that: the first shoulder strap and the second shoulder strap are independent of each other; the first shoulder strap has one end detachably mounted to the upper part of the main compartment on the aforementioned other side, and the other end detachably mounted to the lower part of the main compartment on the aforementioned other side; the second shoulder strap has one end detachably mounted to the upper part of the main compartment on the aforementioned other side, and the other end detachably mounted to the lower part of the main compartment on the aforementioned other side; the backpack includes a strap portion having both ends held in place of one of the first shoulder straps and the second shoulder strap, and extending along the length of the one shoulder strap with a gap between the two ends; the other shoulder strap of the first shoulder strap and the second shoulder strap passes through the aforementioned gap.

2. As requested in item 1, the backpack wherein the first shoulder strap has one end that can be repositioned on the other side above the main compartment, and the second shoulder strap has one end that can be repositioned on the other side above the main compartment.

Images