Student Backpack Waterproof USB Laptop Bag, Size: Medium (Gray) 1. Trolley case strap, more convenient for travel 2. Strong magnetic buckle, not easy to fall off 3. Suitable for computers, notebooks, wallets, umbrellas, etc. 4. Anti-shock air cushion, effective anti-friction, shock absorption, better protect the computer 5. The anti-theft zipper design of the side pocket is separated from the main big pocket 6. Anti-wrinkle and shape-retaining, waterproof for life, wear-resistant and dirt-resistant 7. USB transfer charging port 8. Breathable mesh, comfortable sponge shoulder straps 9. Strong and durable back hanging buckle, can be disassembled at will, switch between one shoulder and two shoulders at will 10. Large front pocket, magnetic opening and closing, convenient and convenient 11. Lining texture: Nylon 12. Processing method: soft surface 13. Opening method: zipper 14. Uses: single shoulder, portable, double shoulder, box push 15. Material: water-repellent and wear-resistant oxford canvas fabric 16. Capacity: the medium size can be loaded into a computer within 13.3-14 inches, and the large size can be loaded into a computer within 15.6 inches 17. Size: medium: 38 x 26 x 12cm, large: 40 x 28 x 12cm 18. Weight: medium: 0.52kg, large: 0.65kg 19. Note: The product only includes a backpack, not other items