1.Material: nylon, elastic cloth 2. Capacity: about 5L 3. Bust: 60-130cm 4. The zipper is made of high-quality material, which is smooth and easy to pull 5. The stitching is tightly reinforced design, strong and durable 6. Reflective strip design, safer to travel at night 7. The design of the mobile phone storage bag on the chest strap can accommodate mobile phones of 6.6 inches and below 8. Adjustable buckle design on the chest, free to adjust, more convenient to use 9. Dimensions: 18 x 35 cm 10. Weight: about 140 grams 11. Note: Only backpacks will be sent for delivery, nothing else!