Feature: 1. 100% brand new and high quality. 2. More humanized design, such as the good breathability and 2cm elasticity of the back, S-shaped ergonomic design of shoulder strap and scientific reasonable weight-bearing design. All these designs can leave you a more comfortable experience. 2. With a humanized USB charging interface design, you can easily keep your smartphone full power anytime and anywhere. That`s more convenient in your life. 3. The fashion simple appearance keeps your young personality. It includes three ways to take which can meet your daily needs. 4. Suitable for all kinds of situations, such as shopping, party, business, trip, college. Specification: Item Type: Backpack Material: Canvas Internal Material: Polyester Open Way: Zipper Internal Structure: Mobile Phone Bags, Document Bags, Zipper Bags Gender: Unisex Style: Leisure, Business, Fashion Features: Comfortable, Convenient, Environmentally Friendly Application: School, Business, Travel Capacity: A4 Magazine, Wallet, Umbrella, Camera, Laptop Size: 17*30*7 cm (Width*Height*Thickness) Weight: 0.3kg approx Note: There is no mobile power comes with the backpack inside. If you want to use External USB Charge Function, you have to do as follows: 1. Buy a mobile power. 2. Connect your mobile power with the USB interface inside the backpack. 3. Connect your phone with the USB interface outside the backpack. 4. Charging begins. There are 2 kinds of mobile power in the market. 1: Plug in your phone, you can start charging. 2: Plug in your phone also needs to press button of mobile power then start charging. To cope with this backpack, we suggest purchase of the first mobile power. Package Included: 1 X Mini Backpack