1.Material: waterproof polyester 2. Function: breathable, waterproof, wear-resistant, shock-resistant, load-reducing 3. Anti-wrinkle twill polyester fabric, strong and durable, good waterproof effect 4. Large-capacity design to meet daily travel needs 5. Three-layer stretch mesh cotton shoulder straps, breathable and comfortable 6. The stitching of the shoulder strap is reinforced, which is strong and durable 7. Dimensions: 29 x 41 x 14 cm 8. Weight: 520 grams 9. Remarks: Only backpacks will be sent for delivery, nothing else!