1.Material: waterproof polyester 2. Function: breathable, waterproof, wear-resistant, anti-theft, USB charging, shock resistance, load reduction 3. Water-repellent and wear-resistant polyester fabric is used to protect the contents of the bag, which is sturdy and durable 4. Large-capacity, multi-compartment 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. Honeycomb back pad, anti-compression shock absorption, breathable and comfortable 8. Side USB interface design, charging is more convenient 9. Dimensions: 28 x 43 x 13 cm 10. Weight: 537 grams 11. Remarks: Only backpacks will be sent for delivery, nothing else!