1. Breathable and wear-resistant, water-repellent, lightweight and portable 2. Large-capacity design, can hold A4 files, wallets, water bottles, laptops, etc. 3. 2 front straps with anti-theft magnetic buckles br>4. Anti-shock double-layer air cushion, effectively anti-friction and shock absorption, better protect the computer 5. Textured hardware buckle, wear-resistant and scratch-resistant 6. Smooth and durable zipper 7. Open Cover method: zipper 9. Processing method: soft surface 10. Material: Oxford cloth 11. Structure: large file layer, inner zipper pocket, shockproof air cushion computer compartment, magnetic buckle pocket x3, Shoulder strap 12. Capacity: medium size can hold a computer within 14 inches, large size can hold a computer within 15.6 inches 13. Size: medium size: 36 x 30 x 9.5cm, large size: 39 x 32 x 9.5cm 14. Weight: Medium: 0.52kg, Large: 0.55kg 15. Note: The product only includes a backpack and does not include other items