1. With USB3.0 charging port on the side, convenient charging 2. With anti-theft combination lock design 3. The exterior is made of oxford fabric, which is water-repellent and can also be used in rainy days 4. Large-capacity main bag, multi-compartment storage board, pocket design, clear classification, reasonable storage 5. 180 degree large opening and closing main bag for easy access to items 6. The back can be used with a trolley case 7. Back ventilation system, S-shaped shoulder straps, stable chest buckle, light and comfortable 8. Top with handle, curved design, smooth and comfortable 9. Material: oxford, polyester 10. Size: about 46 x 30 x 13cm 11. Weight: about 1000g