1. Soft luster, anti-wrinkle and shape retention, waterproof for life, wear-resistant and dirt-resistant 2. Large-capacity storage space, multi-compartment design, can hold chargers, wallets, water bottles, laptops, etc. 3. Computer compartment: 3D airbag shockproof, effectively reducing friction in life 4. Slip pocket x 2: can place small items such as mouse and wallet 5. The main compartment: can hold books, water bottles, clothing, etc. 6. Double stitching + leather, strong and wear-resistant 7. Adjustable shoulder strap, portable, single shoulder 9. Magnetic buckle, anti-rust and durable hardware 10. Material: Oxford cloth 11. Processing method: soft surface 12. Capacity: small size: it can be loaded into a computer within 13.3 inches, 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 13. Portable length: small size: 14-29cm, medium size: 16-33cm, large size: 18-35cm 14. Mouse pad size: 60x30x0.2cm 15. Power storage bag size: 16.5 x 9.5 x 5cm 16. Computer bag size: small: 36 x 25 x 8.5cm, medium: 40 x 27.5 x 11cm, large: 45 x 30 x 11cm 17. Weight: small: 0.32kg, medium: 0.32kg, large: 0.35kg 18. Note: the product only includes the bag, no other items