1. Material: nylon, polyester 2. Function: waterproof, wear-resistant, anti-theft, shock-resistant, capacity expansion, load reduction 3. Accommodates computer size: 15.6 inches 4. Multi-layer and large-capacity design, rational distribution of internal space, easy to take items 5. Independent computer layer, safe and scratch-resistant 6. Pen slot/pocket design, classified storage 7. Keychain design in the bag 8. The back adopts hollow groove design to enhance air convection and effectively dissipate heat 9. The backpack has a USB charging hole, which is more convenient to use 10. Dimensions: 30 x 43 x 12.5 cm 11. Weight: 1.13kg 12. Note: Only backpacks will be sent for delivery, nothing else!