20L capacity + double waterproof and rain cover: high-density 210D nylon fabric + tear-resistant polyester and rain-proof and dust-proof cover to meet the needs of outdoor activities such as walking, hiking, and cycling. There is a rain cover compartment at the bottom of the backpack for easy storage.S-shaped shoulder straps: designed in line with ergonomic principles, thickened shoulder straps, relieve the burden, reasonably balance the weight, and avoid local discomfort caused by uneven force. The interior is designed with multiple compartments, and each layer is carefully classified to avoid the trouble of finding things.Helmet elastic pocket: specially designed for riding helmets, the elastic pocket is made of high-density elastic mesh, which can better protect your helmet and make your travel more convenient.Detachable mobile phone compartment: The mobile phone storage compartment can hold mobile phones of 6.0 inches or less. The secondary compartment can store door card change, etc. The convenient design makes travel more user-friendly.Night reflective design: The front and rear reflective strips of the backpack are designed to reflect strong light in dark environments, improving the safety of running and cycling activities at night.[Brand] Anmeilu[Model]1031 Outdoor Backpack[Size] Length 47CM Width 28CM Thickness 16CM (full thickness)[Occasion] Cycling, hiking, camping, rock climbing, skiing, marathon, trail runningColour: Black GreenMaterial: 210D Nylon+PolyesterPackage Contents:1 * BackpackOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.