A backpack

Abstract

The utility model discloses a knapsack, including knapsack body, the inside of knapsack body is equipped with main knapsack, the front of main knapsack is equipped with vice knapsack, the inside bottom of main knapsack is equipped with battery, the inside side of main knapsack is equipped with PCB board, the back of knapsack body is equipped with heating part, the inside of heating part is equipped with flexible heating sheet, PCB board and battery and flexible heating sheet electric nature links together, the inside of vice knapsack is equipped with camera, the bottom of camera is equipped with infrared sensor, the shooting end of camera and infrared sensor are from the front end of knapsack body and explore, camera and PCB board electric nature links together, the PCB board is connected with charging wire, and charging wire is from the inside of main knapsack and is taken out main knapsack. The utility model discloses through setting up main knapsack and vice knapsack in the knapsack, has realized the reasonable utilization of knapsack internal space, has conveniently used the classified storage and fast taking out article, adopts waterproof zipper and waterproof strip covers waterproof zipper structure.

Description

Technical Field

[0001] This utility model relates to the field of backpack technology, specifically a backpack. Background Technology

[0002] Backpacks are widely used in various fields as a common carrying tool in daily life, travel, study, and work. With the improvement of people's living standards and the diversification of travel needs, higher requirements are being placed on the functionality, comfort, and portability of backpacks.

[0003] A utility model patent with publication number CN220024404U discloses a solar-heated backpack, including a backpack body. A solar panel is mounted on the front of the backpack body, and a flexible lithium battery is installed inside the back of the backpack body. The solar panel and the flexible lithium battery are electrically connected. A flexible heating back panel is detachably mounted on the outside of the back of the backpack body and is electrically connected to the flexible lithium battery. Multiple soft pads are placed between the flexible heating back panel and the back of the backpack body. This patent solution proposes a solar-heated backpack. Through the flexible heating back panel and soft pads, the flexible heating back panel can fit snugly against the traveler's back, ensuring comfort while heating the traveler's back. This provides warmth to maintain body temperature in cold regions without requiring the traveler to exercise to maintain body temperature, and also reduces interference caused by the heating element being too close to the flexible lithium battery.

[0004] Although the solar-heated backpack provided by the aforementioned patent can provide heating, the backpack has limited functionality. The battery cannot charge mobile phones, nor can it monitor the situation behind the backpack. Utility Model Content

[0005] The purpose of this invention is to provide a backpack that improves upon the existing heated backpacks, which have limited functionality, cannot charge mobile phones with their batteries, and cannot monitor the situation behind the backpack.

[0006] This utility model is implemented as follows:

[0007] A backpack includes a backpack body, a main backpack inside the backpack body, a secondary backpack in front of the main backpack, a battery at the bottom of the main backpack, a PCB board on the side of the main backpack, a heating element on the back of the backpack body, a flexible heating element inside the heating element, and the PCB board electrically connected to the battery and the flexible heating element; a camera inside the secondary backpack, an infrared sensor at the bottom of the camera, the camera's shooting end and the infrared sensor protruding from the front of the backpack body, and both the camera and the infrared sensor electrically connected to the PCB board; a charging cable connected to the PCB board, the charging cable passing through the inside of the main backpack.

[0008] Furthermore, the backpack body has a handle at the top, the handle is covered with a cotton cover, and woven straps are symmetrically arranged on both sides of the backpack body, with hanging loops on the woven straps.

[0009] Furthermore, the heating element on the back of the backpack body is made of breathable fabric, and the surface of the heating element has uniform ventilation holes. The flexible heating element has a connector on the side facing the inside of the backpack body, and the connector is used to electrically connect to the PCB board.

[0010] Furthermore, the backpack body has a secondary zipper at the top opening of the secondary backpack, and the secondary backpack has a first waterproof strip above the secondary zipper. The secondary zipper is a waterproof zipper.

[0011] Furthermore, the backpack body is provided with a main zipper at the top opening of the main backpack, the main zipper is a waterproof zipper, and the backpack body is provided with a second waterproof strip above the main zipper.

[0012] Furthermore, the outer layer of the backpack body is made of waterproof fabric, and the surface of the waterproof fabric is coated with a nano-level waterproof coating.

[0013] Furthermore, the main backpack has an inner pocket on the back and an outer pocket on the front side; the backpack body has a connecting platform on the side, a charging slot on the side of the connecting platform, and a charging connector at the bottom of the charging cable for connecting to a mobile phone.

[0014] Furthermore, the backpack body has symmetrical shoulder straps on both sides of the top back, and a first connecting strap at the bottom of the shoulder strap. The first connecting strap has a D-ring buckle. The backpack body has adjustment straps on both sides of the bottom, and the adjustment straps are connected to the D-ring buckles.

[0015] Furthermore, it also includes a first side pocket and a second side pocket, with the top of the first side pocket and the second side pocket having an opening, and the top of the second side pocket having a closed opening.

[0016] Furthermore, the backpack body is provided with a connector near the first side pocket, the connector is provided with a female fastener, the first side pocket is provided with a male fastener, and the male fastener and the female fastener are connected.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention achieves efficient use of the backpack's internal space by incorporating a main backpack and a secondary backpack inside, facilitating the user's organization and quick retrieval of items. The use of waterproof zippers and waterproof strips covering the zipper structure enhances the backpack's waterproof performance, effectively protecting the contents in rainy weather.

[0019] The heating element on the back of the backpack is made of breathable fabric, allowing heat generated by the flexible heating pad to quickly diffuse to the body. This also enhances comfort when the heating pad is not in use. A camera is located at the rear of the secondary backpack, with an infrared sensor at its bottom. The camera integrates a wireless transmission module for easy wireless connection to a mobile phone and image transmission. The camera is connected to a PCB board via wires, allowing the PCB board to allocate battery power to the camera. The camera, along with the infrared sensor, can measure the distance between the person behind and the backpack; if the person gets too close, an alarm will be triggered on the mobile phone.

[0020] This invention features a first side pocket and a second side pocket on both sides of the backpack. The first side pocket has a connector and a button, which can stably secure the opening of the first side pocket and ensure the stability of the items inside. The second side pocket has a top opening that can hold some commonly used tools. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the backpack of this utility model from the side.

[0022] Figure 2 This is a structural schematic diagram of the backpack of this utility model from a front-view angle;

[0023] Figure 3 This is a structural schematic diagram of the backpack of this utility model from a rear-end oblique downward view;

[0024] Figure 4 This is a three-dimensional structural diagram of the backpack of this utility model after being cut open at the front;

[0025] Figure 5 This is a three-dimensional structural diagram of the heating part of this utility model;

[0026] Figure 6 This is a front view structural diagram of the backpack of this utility model;

[0027] Figure 7 This is a rear view structural diagram of the backpack of this utility model.

[0028] In the diagram: 1. Backpack body; 2. Main backpack; 3. Secondary backpack; 4. Camera; 5. Infrared sensor; 6. PCB board; 7. Flexible heating element; 8. Battery; 9. Handle; 10. Cotton cover; 11. Braided strap; 12. Hanging loop; 13. First side pocket; 14. Connector; 15. Male buckle; 16. Female buckle; 17. Outer pocket; 18. Secondary zipper; 19. First waterproof strip; 20. Main zipper; 21. Second waterproof strip; 22. Connecting platform; 23. Charging slot; 24. Charging cable; 25. Second side pocket; 26. Shoulder strap; 27. First connecting strap; 28. D-ring buckle; 29. ​​Adjustment strap; 30. Heating unit; 31. Inner pocket; 32. Connector; 101. Second connecting strap; 102. Card holder; 103. Buckle; 171. Hood. Detailed Implementation

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details:

[0031] Example 1

[0032] like Figure 1 , Figure 6 and Figure 7As shown, a backpack includes a backpack body 1, a main backpack 2 inside the backpack body 1, and a secondary backpack 3 in front of the main backpack 2. The main backpack 2 and the secondary backpack 3 facilitate the classification and storage of items, making the backpack body 1 more convenient to use. A battery 8 is located at the bottom of the main backpack 2, and a PCB board 6 is located on the side of the main backpack 2. An MCU chip is mounted on the PCB board 6. A heating element 30 is located on the back of the backpack body 1, and a flexible heating element 7 is located inside the heating element 30. The PCB board 6 is electrically connected to the battery 8 and the flexible heating element 7. A camera 4 is located inside the secondary backpack 3, and an infrared sensor 5 is located at the bottom of the camera 4. The battery 8 provides power to the flexible heating element 7, the camera 4, and the infrared sensor 5. The PCB board 6 controls the power delivery of the battery 8, facilitating the operation of the entire component. The camera 4 and the infrared sensor 5 protrude from the front of the backpack body 1, and the camera 4 is electrically connected to the PCB board 6. The camera 4 records the situation behind the backpack, and the infrared sensor 5 is used to detect in real time whether someone is approaching the backpack from behind. The PCB board 6 is connected to a charging cable 24, which passes through the inside of the main backpack 2 and exits from the backpack 2. The charging cable 24 is for convenient charging of mobile phones. The camera 4 is equipped with a wireless connection module, including a 4G module to support cellular network communication and a Wi-Fi module as a backup connection method. Together with the battery 8, it ensures battery life. The lens adopts a waterproof and dustproof design to adapt to outdoor environments. A dedicated APP is installed on the mobile phone. During initial configuration, the device is paired through a temporary Wi-Fi hotspot emitted by the camera 4. Subsequently, it defaults to using the 4G network to establish a point-to-point data transmission channel to achieve real-time high-definition image viewing. It supports image quality adjustment to balance data consumption and clarity. The infrared sensor 5 integrated on the camera 4 is set with a detection distance threshold (e.g., within 0.5 meters). When a person approaches and triggers the infrared sensor 5, the camera 4 immediately sends an alarm message to the bound mobile phone through the 4G network. At the same time, the APP triggers a ringtone and vibration alert, and the camera 4 automatically captures an image at the moment of alarm and synchronizes it to the mobile phone album. In addition, all communication data uses an encryption protocol to ensure transmission security and ensure that information is not leaked.

[0033] like Figure 4 As shown, the backpack body 1 has a handle 9 at the top, and the handle 9 is covered with a cotton cover 10. This structure makes it easy to lift the backpack body 1 and to take it out and use it. The backpack body 1 has symmetrical woven straps 11 on both sides, and the woven straps 11 have hanging loops 12. The cooperation between the woven straps 11 and the hanging loops 12 makes it easy to connect some external tools to the backpack body 1 when necessary.

[0034] like Figure 5 and Figure 7As shown, the heating element 30 on the back of the backpack body 1 is made of breathable fabric. The surface of the heating element 30 has uniformly distributed ventilation holes. This structure facilitates the rapid transfer of heat generated by the flexible heating element to the human body. It also allows for ventilation in the area where the backpack and the user are in contact when the flexible heating element 7 is not in use. A connector 32 is located on the side of the flexible heating element 7 facing inwards from the backpack body 1. The connector 32 is used for electrical connection to the PCB board 6.

[0035] like Figure 4 As shown, the backpack body 1 has a secondary zipper 18 at the top opening of the secondary backpack 3, and a first waterproof strip 19 is provided above the secondary zipper 18 in the secondary backpack 3. The secondary zipper 18 is a waterproof zipper, which facilitates opening and closing the secondary backpack 3. The first waterproof strip 19 further enhances the waterproof effect at the location of the secondary zipper 18. The backpack body 1 has a main zipper 20 at the top opening of the main backpack 2, which is also a waterproof zipper. A second waterproof strip 21 is provided above the main zipper 20 in the backpack body 1. This structure ensures good waterproof effect at the top opening of the backpack. The outer layer of the backpack body 1 is made of waterproof fabric, and the surface of the waterproof fabric is coated with a nano-level waterproof coating to improve the overall waterproof effect of the backpack.

[0036] like Figure 4 and Figure 6 As shown, the main backpack 2 has an inner pocket 31 on the back, which is convenient for storing valuables. The front of the backpack has an outer pocket 17, which is convenient for storing frequently used tools. The backpack body 1 has a connecting platform 22 on its side, and a charging slot 23 on the side of the connecting platform 22. The connecting platform 22, in conjunction with the charging slot 23, facilitates charging of the battery 8. The charging cable 24 has a charging connector at its bottom for connecting to a mobile phone.

[0037] like Figure 5 As shown, the backpack body 1 has symmetrical shoulder straps 26 on both sides of the top back. The bottom of each shoulder strap 26 has a first connecting strap 27 with a D-ring buckle 28. The bottom of the backpack body 1 has adjustable straps 29 on both sides, which are connected to the D-ring buckles 28. This structure makes it convenient for users to carry the backpack and also allows for easy adjustment of the length according to different user body sizes.

[0038] Example 2

[0039] like Figure 1 , Figure 5 and Figure 6As shown, a backpack includes a backpack body 1, a main backpack 2 inside the backpack body 1, and a secondary backpack 3 in front of the main backpack 2. The main backpack 2 and the secondary backpack 3 facilitate the classification and storage of items, making the backpack body 1 more convenient to use. A battery 8 is located at the bottom of the main backpack 2, and a PCB board 6 is located on the side of the main backpack 2. An MCU chip is mounted on the PCB board 6. A heating element 30 is located on the back of the backpack body 1, and a flexible heating element 7 is located inside the heating element 30. The PCB board 6 is electrically connected to the battery 8 and the flexible heating element 7. A camera 4 is located inside the secondary backpack 3, and an infrared sensor 5 is located at the bottom of the camera 4. The battery 8 provides power to the flexible heating element 7, the camera 4, and the infrared sensor 5. The PCB board 6 controls the power delivery of the battery 8, facilitating the operation of the entire component. The camera 4 and the infrared sensor 5 protrude from the front of the backpack body 1, and the camera 4 is electrically connected to the PCB board 6. The camera 4 records the situation behind the backpack, and the infrared sensor 5 is used to detect in real time whether someone is approaching the backpack from behind. The PCB board 6 is connected to a charging cable 24, which passes through the inside of the main backpack 2 and exits from the backpack 2. The charging cable 24 is for convenient charging of mobile phones. The camera 4 is equipped with a wireless connection module, including a 4G module to support cellular network communication and a Wi-Fi module as a backup connection method. Together with the battery 8, it ensures battery life. The lens adopts a waterproof and dustproof design to adapt to outdoor environments. A dedicated APP is installed on the mobile phone. During initial configuration, the device is paired through a temporary Wi-Fi hotspot emitted by the camera 4. Subsequently, it defaults to using the 4G network to establish a point-to-point data transmission channel to achieve real-time high-definition image viewing. It supports image quality adjustment to balance data consumption and clarity. The infrared sensor 5 integrated on the camera 4 is set with a detection distance threshold (e.g., within 0.5 meters). When a person approaches and triggers the infrared sensor 5, the camera 4 immediately sends an alarm message to the bound mobile phone through the 4G network. At the same time, the APP triggers a ringtone and vibration alert, and the camera 4 automatically captures an image at the moment of alarm and synchronizes it to the mobile phone album. In addition, all communication data uses an encryption protocol to ensure transmission security and ensure that information is not leaked.

[0040] like Figure 4 As shown, the backpack body 1 has a handle 9 at the top, and the handle 9 is covered with a cotton cover 10. This structure makes it easy to lift the backpack body 1 and to take it out and use it. The backpack body 1 has symmetrical woven straps 11 on both sides, and the woven straps 11 have hanging loops 12. The cooperation between the woven straps 11 and the hanging loops 12 makes it easy to connect some external tools to the backpack body 1 when necessary.

[0041] like Figure 5 and Figure 7As shown, the heating element 30 on the back of the backpack body 1 is made of breathable fabric. The surface of the heating element 30 has uniformly distributed ventilation holes. This structure facilitates the rapid transfer of heat generated by the flexible heating element to the human body. It also allows for ventilation in the area where the backpack and the user are in contact when the flexible heating element 7 is not in use. A connector 32 is located on the side of the flexible heating element 7 facing inwards from the backpack body 1. The connector 32 is used for electrical connection to the PCB board 6.

[0042] like Figure 4 As shown, the backpack body 1 has a secondary zipper 18 at the top opening of the secondary backpack 3, and a first waterproof strip 19 is provided above the secondary zipper 18. The secondary zipper 18 is a waterproof zipper, which facilitates opening and closing the secondary backpack 33. The first waterproof strip 19 further enhances the waterproof effect at the location of the secondary zipper 18. The backpack body 1 has a main zipper 20 at the top opening of the main backpack 2, which is also a waterproof zipper. A second waterproof strip 21 is provided above the main zipper 20. This structure ensures good waterproof effect at the top opening of the backpack. The outer layer of the backpack body 1 is made of waterproof fabric with a nano-level waterproof coating to improve the overall waterproof effect of the backpack.

[0043] like Figure 4 and Figure 6 As shown, the main backpack 2 has an inner pocket 31 on the back, which is convenient for storing valuables. The front of the backpack has an outer pocket 17, which is convenient for storing frequently used tools. The backpack body 1 has a connecting platform 22 on its side, and a charging slot 23 on the side of the connecting platform 22. The connecting platform 22, in conjunction with the charging slot 23, facilitates charging of the battery 8. The charging cable 24 has a charging connector at its bottom for connecting to a mobile phone.

[0044] like Figure 5 As shown, the backpack body 1 has symmetrical shoulder straps 26 on both sides of the top back. The bottom of each shoulder strap 26 has a first connecting strap 27 with a D-ring buckle 28. The bottom of the backpack body 1 has adjustable straps 29 on both sides, which are connected to the D-ring buckles 28. This structure makes it convenient for users to carry the backpack and also allows for easy adjustment of the length according to different user body sizes.

[0045] like Figure 4 and Figure 5As shown, the backpack also includes a first side pocket 13 and a second side pocket 25. Both the first side pocket 13 and the second side pocket 25 have openings at their tops, while the second side pocket 25 has a closed top. This structure allows items to be placed on both sides of the backpack body 1. A connector 14 is located near the first side pocket 13 on the backpack body 1. The connector 14 has a female fastening head 16, and the first side pocket 13 has a male fastening head 15. The male fastening head 15 and the female fastening head 16 are connected. This structure facilitates the placement of items inside the first side pocket 13, thereby ensuring the stability of the items inside.

[0046] Example 3

[0047] like Figures 1-3As shown, a backpack includes a backpack body 1, a main backpack 2 inside the backpack body 1, and a secondary backpack 3 in front of the main backpack 2. The main backpack 2 and the secondary backpack 3 facilitate the classification and storage of items, making the backpack body 1 more convenient to use. A battery 8 is located at the bottom of the main backpack 2, and a PCB board 6 is located on the side of the main backpack 2. An MCU chip is mounted on the PCB board 6. A heating element 30 is located on the back of the backpack body 1, and a flexible heating element 7 is located inside the heating element 30. The PCB board 6 is electrically connected to the battery 8 and the flexible heating element 7. A camera 4 is located inside the secondary backpack 3, and an infrared sensor 5 is located at the bottom of the camera 4. The battery 8 provides power to the flexible heating element 7, the camera 4, and the infrared sensor 5. The PCB board 6 controls the power delivery of the battery 8, facilitating the operation of the entire component. The camera 4 and the infrared sensor 5 protrude from the front of the backpack body 1, and the camera 4 is electrically connected to the PCB board 6. The camera 4 records the situation behind the backpack, and the infrared sensor 5 is used to detect in real time whether someone is approaching the backpack from behind. The backpack body 1 has a main zipper 20 at the top opening of the main backpack 2. The main zipper 20 is a waterproof zipper. The backpack body 1 has a handle 9. In this embodiment, there are two handles 9, which are located on the front and back sides of the top opening of the main backpack 2. A buckle assembly is provided below the handles 9. The buckle assembly includes a first connecting strap 101, a card holder 102, and a matching buckle 103. The buckle 103 is fixedly set at the front of the top opening of the main backpack 2, and the card holder 102 is fixedly set at the rear of the top opening of the main backpack 2 through the first connecting strap 101. The two are set opposite each other. When the user's bag contains heavy items, the buckle assembly can be used to further secure them. An outer pocket 17 is provided on the front side of the outer side of the backpack. The outer pocket 17 is for storing commonly used tools. A hood 171 is provided at the top of the outer pocket 17. Stainless steel snaps or stainless steel snap fasteners are provided on the inner side of the lower end of the hood 171 and on the surface of the outer pocket 17, respectively. The lower end of the hood 171 is locked to the outer pocket 17 by the stainless steel snaps or stainless steel snap fasteners to prevent the tools inside from falling out. When the user needs to use the tools inside, the hood 171 can be opened at any time, which is very convenient. The hood 171 can also prevent dust and water splashes.

[0048] Working principle: The battery 8 inside the main backpack 2 powers the PCB board 6, flexible heating element 7, camera 4, and infrared sensor 5. The PCB board 6 controls the power delivery of the battery 8 to coordinate the operation of each component. The flexible heating element 7 generates heat in the heating section 30 by connecting to the PCB board 6. The heat is transferred to the body through the breathable fabric and ventilation holes. When not in use, the breathable structure ensures ventilation in the contact area. The camera 4 and the infrared sensor 5 at the bottom protrude from the front of the backpack. The camera 4 establishes data transmission with a mobile app via a 4G module (Wi-Fi module is optional), allowing real-time viewing of high-definition images and supporting image quality adjustment. When the infrared sensor 5 detects someone approaching within 0.5 meters, it triggers the camera 4 to capture an image and send an alarm message to the mobile phone via the 4G network. Simultaneously, the app alerts the user with a ringtone and vibration, and the data transmission is encrypted. Furthermore, the battery 8 can also charge the mobile phone via the charging cable 24 extending from the main backpack 2, while the charging slot 23 of the connector 22 is used to charge the battery 8.

[0049] In summary, compared with existing technologies, this application achieves rational utilization of the internal space of the backpack by setting up a main backpack 2 and a secondary backpack 3 inside the backpack, making it convenient for users to classify, store, and quickly retrieve items. The use of waterproof zippers and waterproof strips to cover the waterproof zipper structure enhances the backpack's waterproof performance, effectively protecting the items inside the bag in rainy weather. The heating element 30 on the back of the backpack is made of breathable fabric, facilitating the rapid diffusion of heat generated by the flexible heating element to the human body, and also making the user more comfortable when not using the flexible heating element. A camera 4 is located at the rear of the secondary backpack 3, with an infrared sensor 5 at its bottom. The camera 4 integrates a wireless transmission module, facilitating wireless connection between the camera 4 and a mobile phone, and also facilitating image transmission from the camera 4 to the mobile phone. The camera 4 is connected to the PCB board 6 via wires, allowing the PCB board 6 to allocate power from the battery 8 to the camera 4. Simultaneously, the camera 4, in conjunction with the infrared sensor 5, can measure the distance between people behind and the backpack; if a person gets too close, the mobile phone will receive an alarm.

[0050] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this 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 backpack, comprising a backpack body, characterized in that, The backpack body contains a main backpack, with a secondary backpack located in front of the main backpack. The main backpack contains a battery, and a PCB board is located on the inner side of the main backpack. A heating element is located on the back of the backpack body, containing a flexible heating element. The PCB board is electrically connected to the battery and the flexible heating element. A camera is located inside the secondary backpack, with an infrared sensor at its bottom. The camera's shooting end and the infrared sensor protrude from the front of the backpack body, and the camera is electrically connected to the PCB board. A charging cable is connected to the PCB board, extending from the inside of the main backpack.

2. A backpack according to claim 1, characterized in that, The backpack body has a handle at the top, which is covered with a cotton cover. The backpack body has symmetrical woven straps on both sides, and the woven straps have hanging loops.

3. A backpack according to claim 1, characterized in that, The heating element on the back of the backpack body is made of breathable fabric. The surface of the heating element has uniform ventilation holes. The flexible heating element has a connector on the side facing the inside of the backpack body. The connector is used to electrically connect to the PCB board.

4. A backpack according to claim 1, characterized in that, The backpack body has a secondary zipper at the top opening of the secondary backpack, and the secondary backpack has a first waterproof strip above the secondary zipper. The secondary zipper is a waterproof zipper.

5. A backpack according to claim 1, characterized in that, The backpack body has a main zipper at the top opening of the main backpack, the main zipper is a waterproof zipper, and the backpack body has a second waterproof strip above the main zipper.

6. A backpack according to claim 1, characterized in that, The outer layer of the backpack body is made of waterproof fabric, and the surface of the waterproof fabric is coated with a nano-level waterproof coating.

7. A backpack according to claim 1, characterized in that, The main backpack has an inner pocket on the back and an outer pocket on the front side. The backpack body has a connecting platform on the side, a charging slot on the side of the connecting platform, and a charging connector at the bottom of the charging cable for connecting to a mobile phone.

8. A backpack according to claim 1, characterized in that, The backpack body has symmetrical shoulder straps on the top two sides of the back, and a first connecting strap at the bottom of the shoulder strap. The first connecting strap has a D-ring buckle. The backpack body has adjustment straps on both sides of the bottom, and the adjustment straps are connected to the D-ring buckles.

9. A backpack according to any one of claims 1-8, characterized in that, It also includes a first side pocket and a second side pocket, the first side pocket and the second side pocket having openings at their top, and the second side pocket having a closed top.

10. A backpack according to claim 9, characterized in that, The backpack body has a connector near the first side pocket, the connector has a female fastener, and the first side pocket has a male fastener, the male fastener and the female fastener are connected.

Images