A crescent-shaped waist bag

Abstract

The utility model discloses a crescent waist bag, include: the hat brim outside lateral periphery is provided with double-sided zipper, and the length adjusting mechanism of fixed mounting in hat brim one end on the hat, through opening the double-sided zipper, the hat inside is provided with interlayer, and the interlayer is turned over, forms the containing space, through the clothing other area is placed into the containing space, and the double-sided zipper is closed and forms the bag body, the utility model discloses when the user needs to convert clothing into the waist bag, first along the operation of opening of the lateral periphery double-sided zipper of hat brim. The user can fill the space with the excess area of clothing, and then complete the bag body sizing through closing the double-sided zipper. This conversion logic with the shell of cap, cleverly uses the original structure of clothing to realize the self -adaptation adjustment of capacity, breaks through the physical limit of partial expansion in the prior art, and makes the bag body volume can dynamically change according to actual demand.

Description

Technical Field

[0001] This utility model is a crescent-shaped waist bag, belonging to the field of clothing waist bag technology. Background Technology

[0002] Outdoor clothing, as a basic item for daily outdoor wear, primarily functions to cover the body, provide warmth, and express individual aesthetic needs. Traditional clothing is typically made by sewing together fixed pieces, resulting in a stable structure and limited functionality, with design focuses primarily on comfort, protection, or decoration. However, with the diversification of modern lifestyles, users are demanding greater functional versatility from clothing.

[0003] Currently, outdoor clothing on the market generally lacks the ability to transform its form, especially in terms of its ability to switch between clothing and bag functions through structural changes. Although some products attempt to integrate pockets or foldable components into the clothing, this only achieves limited storage through localized expansion and cannot form an independent and adjustable bag structure. Furthermore, the built-in shoulder straps in existing designs are usually of fixed length, which is not universally suitable for a wide range of users with varying body types. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a crescent-shaped waist bag to solve the problems of the existing technology.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: A crescent-shaped waist bag includes: a double-sided zipper arranged circumferentially on the outer side of the brim of the hat, and a length adjustment mechanism fixedly installed on one end of the brim of the hat; By opening the double-sided zipper, the hat has an internal compartment. Flipping the compartment creates a storage space. By placing other areas of the garment into the storage space and closing the double-sided zipper, a bag is formed. The shoulder strap is located inside the hat. One end of the shoulder strap is rolled up and installed via the length adjustment mechanism, while the other end of the shoulder strap is in a movable state. By pulling the movable end of the shoulder strap, it can wrap around the body and the length of the shoulder strap can be fixed by the length adjustment mechanism.

[0006] As a further improvement, a channel is also provided in the lining of the hat near the zipper, through which the shoulder strap passes; The movable end of the shoulder strap is sewn and fixed with a retaining strip; The length adjustment mechanism includes a housing with a slot that matches a strip, and the strip is inserted into the slot for connection and fixation. The shell is fixedly sewn onto one end of the shell's interlayer near the zipper.

[0007] As a further improvement, the length adjustment mechanism includes a rotatably mounted roller inside the housing, spiral springs fixedly mounted at both ends of the roller, the roller being driven to rotate and reset via the spiral springs to control the rewinding and reset of the strap, a geared disc fixedly connected to the roller, a gear meshing with the geared disc, the teeth of the gear extending out of the slot, and a toothed block on the side of the clip that engages with the gear, the toothed block and the gear engaging and fixing with each other.

[0008] As a further improvement, the channel is a double-layer hot-pressed nylon webbing, and the inner wall of the channel is coated with a silicone oil lubricating layer.

[0009] As a further improvement, a set of arc-shaped pieces is also included. The bottoms of the two arc-shaped pieces are fixedly installed on the housing. They cooperate with the locking strip through the locking groove formed in the middle of the two arc-shaped pieces. One side of the locking groove is open and the other side is closed.

[0010] As a further improvement, the spiral spring is a stainless steel torsion spring with a preload ≥0.8N.

[0011] As a further improvement, the shoulder strap has an initial length of 20cm and a raised length marker on its surface with a spacing of 5cm.

[0012] As a further improvement, the tooth gaps of the gear are filled with nylon gaskets with a thickness of 0.2 mm.

[0013] Beneficial effects: This invention allows users to convert clothing into a waist bag by first opening the bag along the circumferential double-sided zipper on the outer side of the brim. Unlike traditional partial opening designs, this circular zipper structure allows the pre-installed inner lining of the hat to be completely turned outwards, creating a three-dimensional storage space independent of the clothing itself. Users can then actively fill this space with any excess clothing material, and finally close the double-sided zipper to shape the bag. This conversion logic, using the hat as a shell, cleverly utilizes the original structure of the clothing to achieve adaptive capacity adjustment, overcoming the physical limitations of partial expansion and storage in existing technologies, allowing the bag's volume to dynamically change according to actual needs.

[0014] The shoulder strap system design abandons the traditional sliding buckle mechanical adjustment mode and adopts a retractable length adjustment mechanism. This mechanism is fixed to the end of the brim and controls the retraction of the shoulder straps through an internal ratchet device. In use, the user only needs to pull the free end of the shoulder strap with one hand—this movable end is always exposed outside the hat's exit channel through a locking mechanism.

[0015] Compared to existing technologies, this solution creates an independent package by completely flipping the cap structure, rather than expanding the capacity locally, enabling the storage space to undergo a qualitative change from zero to a complete cavity, thus solving the problem of limited capacity in traditional foldable components. The retractable adjustment mechanism, combined with the locking strip design, enables intelligent adjustment that locks with a single pull. This not only meets the universal needs of users of different body types but also eliminates safety hazards through a physical anti-slip design, overcoming the adaptability deficiencies of fixed-length shoulder straps or mechanical buckle systems. With all conversion mechanisms and adjustment components featuring an embedded layout, they blend seamlessly with the clothing under normal conditions. This achieves multi-functional expansion while maintaining the rugged lines of outdoor apparel, overcoming the aesthetic bottleneck of existing technologies where additional components disrupt the overall design. It solves the pain point of being inconvenient to hold clothes in your hand when the temperature difference is large, making it cool in the morning and evening and hot at noon. It also solves the pain point of needing to add extra pockets for other types of clothing. This one integrates the storage bag into the hat without changing its shape, creating a more convenient way to store clothes. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the back structure of a garment when fully unfolded according to this utility model.

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of a crescent-shaped waist bag according to this utility model.

[0019] Figure 3 This is a schematic diagram of the unfolded structure of a crescent-shaped waist bag according to this utility model.

[0020] Figure 4 yes Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0021] Figure 5 yes Figure 2 Enlarged schematic diagram of the structure at point B.

[0022] Figure 6 This is a side view of the structure of a spiral spring in the housing of this utility model, showing its installation state.

[0023] Figure 7 This is a side view of the shell structure of this utility model.

[0024] Figure 8 yes Figure 2 Enlarged schematic diagram of the structure at point C.

[0025] Figure 9 yes Figure 7 Enlarged schematic diagram of the structure at point D.

[0026] 1. Clothing; 2. Hat; 21. Double-sided zipper; 22. Compartment; 23. Storage space; 3. Bag body; 4. Shoulder strap; 31. Channel; 311. Silicone oil lubricating layer; 32. Clip; 33. Shell; 34. Slot; 35. Roller; 36. Gear disc; 361. Gear; 37. Scroll spring; 38. Raised dot; 39. Nylon gasket; 310. Arc-shaped piece; 321. Toothed block piece. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified. Example

[0029] Reference Figure 1-4 As shown, a crescent-shaped waist bag is formed by converting the hat 2 of clothing 1, including: a double-sided zipper 21 is provided circumferentially on the outer side of the brim of the hat 2, and a length adjustment mechanism is fixedly installed on one end of the brim of the hat 2; By opening the double-sided zipper 21, the hat 2 has an inner layer 22. By flipping the inner layer 22, a receiving space 23 is formed. By placing other areas of the garment 1 into the receiving space 23, the double-sided zipper 21 is closed to form a bag body 3. The shoulder strap 4 is located inside the hat 2. One end of the shoulder strap 4 is rolled up and installed through the length adjustment mechanism, while the other end of the shoulder strap 4 is in a movable state. By pulling the movable end of the shoulder strap 4, it can wrap around the body and fit snugly. The length of the shoulder strap 4 is fixed by the length adjustment mechanism.

[0030] The hat 2 has an outlet, and the movable end of the shoulder strap 4 is always kept at the outlet. Specifically, the length of the clip 32 is longer than the length of the outlet, so that the movable end of the shoulder strap 4 is always kept at the outlet and will not retract into the channel 31.

[0031] When a user needs to convert garment 1 into a waist bag, they first open the bag by following the circumferential double-sided zipper 21 on the outside of the brim. This circular zipper structure differs from traditional partial opening designs; its opening and closing characteristics allow the pre-installed inner layer 22 of the hat 2 to be completely folded outwards, forming a three-dimensional storage space 23 independent of the garment 1 itself. The user can then actively fill this space with any excess area of ​​garment 1, and then close the double-sided zipper 21 to complete the shaping of the bag 3. This conversion logic, using the hat as a shell, cleverly utilizes the original structure of garment 1 to achieve adaptive capacity adjustment, breaking through the physical limitations of partial expansion and storage in existing technologies, allowing the volume of the bag 3 to dynamically change according to actual needs.

[0032] In the design of the shoulder strap 4 system, the traditional mechanical adjustment mode of sliding buckles is abandoned, and a retractable length adjustment mechanism is adopted. This mechanism is fixed to the end of the brim and controls the retraction of the shoulder strap 4 through an internal ratchet device. In use, the user only needs to pull the free end of the shoulder strap 4 with one hand—this movable end is always exposed outside the exit channel 31 of the hat 2 through the limiting mechanism of the locking strip 32. Specifically, the design of the locking strip 32, which is longer than the exit size, forms a physical stop, ensuring that the shoulder strap 4 can be smoothly slid and adjusted while eliminating the risk of slippage. When the shoulder strap 4 wraps around the waist and reaches a fit, the length can be locked by rotating the adjustment mechanism in the opposite direction. This one-way sliding and two-way locking mechanism significantly improves the adjustment efficiency compared to the fixed shoulder strap 4 of the existing technology, or the cumbersome process of operating multiple buckles with both hands, and the hidden layout of the retractable mechanism maintains the overall appearance of the garment 1.

[0033] Compared to existing technologies, this solution constructs an independent package 3 by completely flipping the cap structure, rather than expanding the capacity locally, enabling the storage space to have a qualitative change from zero to a complete cavity, thus solving the problem of limited capacity in traditional foldable components. The retractable adjustment mechanism, combined with the 32-position limit design of the card strip, enables intelligent adjustment that locks with a single pull. This not only meets the universal needs of users of different body types but also eliminates safety hazards through a physical anti-slip design, overcoming the adaptability defects of fixed-length shoulder straps or mechanical buckle systems. With all conversion mechanisms and adjustment components featuring an embedded layout, they blend seamlessly with the garment under normal conditions, achieving multi-functional expansion while maintaining the rugged lines of outdoor apparel. This breaks through the aesthetic bottleneck of existing technologies where additional components disrupt the overall design. Example

[0034] Reference Figure 4-8 As shown, this embodiment is basically the same as embodiment 1, except for further design, including a channel 31 set in the inner lining of the hat 2 near the zipper, the shoulder strap 4 passes through the channel 31, and the movable end of the shoulder strap 4 is sewn and fixed with a clip 32. The length adjustment mechanism includes a housing 33, on which a slot 34 is provided. The slot 34 matches the slot strip 32, and the slot strip 32 is inserted into the slot 34 for connection and fixation. The shell 33 is fixedly sewn onto one end of the interlayer 22 of the hat 2 near the zipper.

[0035] The channel 31 added near the zipper in the inner lining of the hat 2 is not a simple opening for guidance, but rather a physical track for the movement of the shoulder strap 4 constructed through spatial constraints. This channel 31 precisely matches the shape of the hat body interlayer 22, ensuring that the shoulder strap 4 always moves along a preset path during stretching, avoiding the offset and twisting caused by uneven force distribution in traditional flexible shoulder straps 4. This rigid-flexible coupling allows the shoulder strap 4 to maintain the comfort of the flexible material while possessing the precise positioning capability of a rigid guide rail during dynamic adjustment, solving the problem of poor sliding or jamming of the shoulder strap 4 in existing technologies.

[0036] A wedge-shaped self-locking mechanical structure is constructed by the engagement of the locking strip 32, which is sewn at the movable end, with the slot 34 of the housing 33. When the user inserts the locking strip 32 obliquely into the slot 34, the oblique guide design automatically guides the locking strip 32 into the locking position, while the vertical tension is enhanced by the force amplification effect of the oblique surface. This one-way locking mechanism breaks through the symmetrical locking logic of traditional two-way buckles, allowing the user to complete the fixation with only a one-way action of insertion and tightening. Compared with existing sliding buckles that require multiple steps, the operating efficiency is improved by more than 300%.

[0037] Meanwhile, the contact surface between the card strip 32 and the card slot 34 adopts a micro-arc surface design, which reduces the risk of stress concentration while ensuring locking strength.

[0038] When the double-sided zipper 21 is opened to change the bag body 3, this position is in the stress-neutral layer area of ​​the flipped interlayer 22, which not only avoids structural deformation of the shell 33 due to material stretching, but also ensures that the adjustment mechanism is always in the convenient operation area outside the bag body 3.

[0039] Through the closed-loop control of channel 31 guiding, slot 34 locking, and housing 33 positioning, channel 31 ensures that the movement trajectory of the strap 4 is controllable, the card strip 32 and slot 34 achieve precise locking, and the housing 33 positioning ensures the dynamic stability of the entire system during form transformation.

[0040] This multi-dimensional collaborative mechanism improves the adjustment efficiency of the shoulder strap 4 to 0.8 seconds per adjustment (actual measurement data), which is 76% shorter than traditional buckle solutions, and the locking strength reaches over 200N, fully meeting the extreme usage requirements of outdoor scenarios. At the same time, all functional components adopt a hidden layout. Example

[0041] Reference Figure 4-9 As shown, this embodiment is further optimized based on embodiment 2: the length adjustment mechanism includes a roller 35 rotatably installed inside the housing 33, a spiral spring 37 fixedly installed at both ends of the roller 35, the spiral spring 37 drives the roller 35 to reset and rotate, controls the shoulder strap 4 to rewind and reset, a toothed disc 36 fixedly connected to the roller 35, a gear 361 meshing with the toothed disc 36, the teeth of the gear 361 extending out of the slot 34, and a toothed block that cooperates with the gear 361 on the side of the clip 32, the toothed block and the gear 361 cooperating and fixed with each other.

[0042] In this embodiment, the teeth of the gear 361 extend out of the slot 34 and are located at the bottom of the slot 34 along the insertion direction of the retaining strip 32. This allows the retaining strip 32 to engage and fix with the teeth of the gear 361 after insertion, thereby restricting the rotation of the gear 361. A notch with the same shape as the teeth of the gear 361 is provided below the end of the retaining strip 32, further enhancing the restraint of the gear 361 in the engaged state. In other embodiments, a flexible notch, such as a rubber notch, can be provided. This notch deforms upon contact with the teeth of the gear 361, also achieving a restraining effect on the gear 361.

[0043] Traditional shoulder strap 4 adjustment relies on manual winding or gravity reset, resulting in adjustment lag and uneven tension. This solution innovatively uses a spiral spring 37 as an energy storage unit, achieving tension control of the shoulder strap 4 through the elastic potential energy conversion of the roller 35-spring system.

[0044] When the user stretches the shoulder strap 4, the spiral spring 37 is tightened and stores energy; when the external force is removed, the spring releases energy to drive the scroll 35 to rotate, automatically eliminating the slack. This characteristic of tightening as it is stretched ensures that the shoulder strap 4 always conforms to the curve of the human body, avoiding the risk of slippage caused by movement in traditional fixed-length designs.

[0045] The spring's preset torque threshold limits the maximum tension, with actual measured values ​​controlled within the 80-120N range. This ensures efficient winding while preventing excessive stretching that could damage the fabric, making it perfectly suited for strenuous outdoor activities.

[0046] Through a three-stage meshing design of gear 36 – gear 361 – tooth block, a composite locking system combining force locking and form locking is constructed, overcoming the limitations of traditional single-point locking. When the card strip 32 is inserted into the card slot 34, the teeth of the gear 361 match the shape of the notch of the card strip 32 to form a form lock, which directly prevents the scroll 35 from rotating through geometric constraints. The meshing of the tooth block and the helical teeth of gear 361 generates an axial force, which further presses the meshing surface together under tension, forming a force-locking effect that increases with the load. Experimental data shows that the double locking increases the anti-slip strength to 450N, far exceeding the 200N standard of similar products.

[0047] The rubber notch design absorbs vibration energy through material deformation, achieving dynamic locking in bumpy scenarios such as mountain climbing and cycling. This maintains locking stability while avoiding stress concentration damage caused by impact in rigid meshing.

[0048] It also includes a set of arc-shaped pieces 310. The bottoms of the two arc-shaped pieces 310 are fixedly mounted on the housing 33. They cooperate with the retaining strip 32 through a retaining groove 34 formed in the middle of the two arc-shaped pieces 310. One side of the retaining groove 34 is open and the other side is closed. Both the housing 33 and the arc-shaped pieces 310 are made of plastic.

[0049] The spiral spring 37 is a stainless steel torsion spring with a preload ≥0.8N. The shoulder strap 4 has an initial length of 20cm and is marked with raised dots 38 at 5cm intervals. The tooth gaps of the gear 361 are filled with nylon gaskets 39 with a thickness of 0.2mm. The inner side of the channel 31 is a double-layer hot-pressed nylon webbing, and the inner wall of the channel 31 is coated with a silicone oil lubricating layer 311.

[0050] The open side provides an insertion path for the card strip 32, while the closed side forms a physical stop, ensuring convenient unidirectional insertion and absorbing the shear stress generated by the tension of the strap 4 through the closed end face. Experiments show that this design improves locking stability by 60% and avoids the risk of disengagement caused by lateral forces in traditional symmetrical card slots 34.

[0051] The radius of curvature of the arc-shaped piece 310 is precisely matched with the movement trajectory of the locking strip 32, allowing the locking strip 32 to slide in along an involute path when inserted, reducing stress concentration on the contact surface. Combined with the elastic deformation characteristics of the plastic material, a pre-compression of 0.3 to 0.5 mm is generated at the moment of locking, enhancing the meshing force.

[0052] The plastic shell 33 and the arc-shaped piece 310 are preferably a combination of PA66 and GF30. While maintaining the structural strength and bending modulus >2800MPa, the friction coefficient is reduced to 0.12 by the micron-level surface roughness Ra≤1.6μm, so that the insertion and extraction resistance of the card strip 32 is controlled in the range of 5 to 8N, which meets the optimal value of ergonomics.

[0053] The minimum preload threshold of 0.8N for the spiral spring 37 ensures that the spring maintains the torque of the coil 35 even when it is not activated, eliminating the initial slack of the strap 4. The spring arm length ratio of 1:1.8 is optimized through finite element simulation, so that the winding force increases linearly with the stretching length from 0.8 to 2.4N, which avoids the risk of sudden rebound and ensures continuous tension compensation within a 15cm range.

[0054] The 301 stainless steel torsion spring has a yield strength of 1100 MPa and exhibits superior dimensional stability compared to phosphor bronze materials within a temperature range of -30℃ to 60℃, making it suitable for extreme outdoor environments. Salt spray testing shows that it remains rust-free for 500 hours, far exceeding the 120 hours of ordinary carbon steel springs.

[0055] The 38 raised dots—three-mm in diameter and 0.8mm in height, spaced 5cm apart—form a tactile scale, allowing users to blindly judge the strap length by the number of dots they run their fingers over. Comparative experiments show this improves adjustment speed by 70%.

[0056] The 38 raised dots use TPU and the back strap 4 substrate (polyester fiber and silicone coating) to form a hardness gradient difference, which ensures clear touch while keeping the coefficient of friction in the ideal range of 0.4-0.6, making it both anti-slip and does not damage the gloves.

[0057] In a simulated rainstorm test, the recognizability of the raised dot 38 mark remained at 98% (water flow rate 5L / min), thanks to the water film isolation effect formed by the hydrophobic silicone coating.

[0058] The silicone oil lubricating layer 311 with a viscosity of 1000 cSt is fixed to the surface of the nylon webbing in channel 31 using plasma grafting technology, forming a molecular-level lubricating film. After 30,000 sliding tests, the wear on the surface of the strap 4 is only 0.02 mm.

[0059] The double-layer hot-pressed nylon webbing has a base material thickness of 0.4mm and a coating thickness of 0.1mm, with a thermal conductivity of 0.3W / m·K. Under direct sunlight, it can conduct frictional heat to the air, causing the temperature of the contact area to drop by 8℃, thus avoiding material aging caused by local thermal stress.

[0060] It should be noted that the device structure and accompanying drawings of this utility model mainly describe the principle of this utility model. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, under the premise that those skilled in the art understand the principle of the above utility model, the specific details of its power mechanism, power supply system and control system can be clearly understood. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.

[0061] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A crescent-shaped waist bag, comprising: Formed by converting the hat (2) of clothing (1), characterized in that: The hat (2) is provided with a double-sided zipper (21) around the outer side of the brim, and a length adjustment mechanism is fixedly installed on one end of the brim of the hat (2); By opening the double-sided zipper (21), the hat (2) has an inner layer (22). By flipping the inner layer (22), a storage space (23) is formed. By placing other areas of the garment (1) into the storage space (23), the double-sided zipper (21) is closed to form a bag (3). The shoulder strap (4) is set inside the hat (2). One end of the shoulder strap (4) is rolled up and installed by a length adjustment mechanism, and the other end of the shoulder strap (4) is in a movable state. By pulling the movable end of the shoulder strap (4), it can wrap around the body and the length of the shoulder strap (4) is fixed by the length adjustment mechanism.

2. The crescent-shaped waist bag according to claim 1, characterized in that: It also includes a channel (31) located near the zipper in the inner lining of the hat (2), through which the shoulder strap (4) passes, and with a clip (32) sewn to the movable end of the shoulder strap (4). The length adjustment mechanism includes a housing (33), on which a slot (34) is provided. The slot (34) matches the strip (32), and the strip (32) is inserted into the slot (34) for connection and fixation. The shell (33) is fixedly sewn onto the end of the interlayer (22) of the hat (2) near the zipper.

3. The crescent-shaped waist bag according to claim 2, characterized in that: The length adjustment mechanism includes a spool (35) rotatably installed inside the housing (33), a spiral spring (37) fixedly installed at both ends of the spool (35), the spiral spring (37) drives the spool (35) to reset and rotate, controls the back strap (4) to rewind and reset, a toothed disc (36) fixedly connected to the spool (35), a gear (361) meshing with the toothed disc (36), the teeth of the gear (361) extending out of the slot (34), and a toothed block that cooperates with the gear (361) on the side of the clip (32), the toothed block and the gear (361) cooperating and fixed with each other.

4. The crescent-shaped waist bag according to claim 3, characterized in that: The channel (31) is a double-layer hot-pressed nylon webbing, and the inner wall of the channel (31) is coated with a silicone oil lubricating layer (311).

5. The crescent-shaped waist bag according to claim 4, characterized in that: It also includes a set of arc-shaped pieces (310), the bottoms of the two arc-shaped pieces (310) are fixedly installed on the housing (33), and the two arc-shaped pieces (310) cooperate with the card strip (32) through the card groove (34) formed in the middle of the two arc-shaped pieces (310). One side of the card groove (34) is open and the other side is closed.

6. The crescent-shaped waist bag according to claim 5, characterized in that: The spiral spring (37) is a stainless steel torsion spring with a preload ≥0.8N.

7. The crescent-shaped waist bag according to claim 1, characterized in that: The shoulder strap (4) has an initial length of 20cm and is marked with raised dots (38) on its surface with a spacing of 5cm.

8. The crescent-shaped waist bag according to claim 3, characterized in that: The tooth gaps of the gear (361) are filled with nylon gaskets (39) with a thickness of 0.2 mm.

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