1. [Theft Prevent Combination Lock]: The multipurpose sling backpack is equipped with anti theft combination lock, which can be easily set up with 3 digit password, effectively preventing thieves from opening the zipper and stealing the contents of the bag. 2. [With USB Port]: The waterproof sling backpack built in USB port, making it easy for you to connect the charging bank and charge your phone at any time, allowing your mobile device is always powered up. 3. [Fatigue Reduction]: The casual sling bag has interchangeable design of the left and right shoulders, which can effectively alleviate the shoulder fatigue caused by carrying the backpack for a long time. 4. [Waterproof Design]: The sling bag has waterproof design, which can effectively resist the soaking of rain, whether is rainy or wetland environment, your bag contents can be completely protected. 5. [Fabric Material]: The USB charging sling backpack is made of premium fabric material, which is durable and soft, can be used for a long time, and is comfortable to wear. Spec: Item Type: Multipurpose Sling Backpack Material: Fabric PackageList: 1 x Sling Backpack 1 x USB Cable [Fatigue Reduction]: The casual sling bag has interchangeable design of the left and right shoulders, which can effectively alleviate the shoulder fatigue caused by carrying the backpack for a long time. [Theft Prevent Combination Lock]: The multipurpose sling backpack is equipped with anti theft combination lock, which can be easily set up with 3 digit password, effectively preventing thieves from opening the zipper and stealing the contents of the bag. 96i3rvc4pg-12 [With USB Port]: The waterproof sling backpack built in USB port, making it easy for you to connect the charging bank and charge your phone at any time, allowing your mobile device is always powered up. [Fabric Material]: The USB charging sling backpack is made of premium fabric material, which is durable and soft, can be used for a long time, and is comfortable to wear. [Waterproof Design]: The sling bag has waterproof design, which can effectively resist the soaking of rain, whether is rainy or wetland environment, your bag contents can be completely protected. [Fatigue Reduction]: The casual sling bag has interchangeable design of the left and right shoulders, which can effectively alleviate the shoulder fatigue caused by carrying the backpack for a long time. [Theft Prevent Combination Lock]: The multipurpose sling backpack is equipped with anti theft combination lock, which can be easily set up with 3 digit password, effectively preventing thieves from opening the zipper and stealing the contents of the bag. 96i3rvc4pg-12 [With USB Port]: The waterproof sling backpack built in USB port, making it easy for you to connect the charging bank and charge your phone at any time, allowing your mobile device is always powered up. [Fabric Material]: The USB charging sling backpack is made of premium fabric material, which is durable and soft, can be used for a long time, and is comfortable to wear. [Waterproof Design]: The sling bag has waterproof design, which can effectively resist the soaking of rain, whether is rainy or wetland environment, your bag contents can be completely protected.