Material: 600D waterproof Nylon Capacity: 40-45L Main Compartment: 48 * 35* 18cm / 19 * 14 * 7in (Height * Width * Depth) Molle system is convenient for you to expand capacity of the bag With D shaped rings on the shoulder straps, you can hang umbrella on it Double metal zippers design, more durable Padded and adjustable shoulder straps. Adjustable chest belt and hip belt and padded waist strap. Adjustable chest belt and waist belt offer you comfortable size Features spacious main compartment with zip around closure, interior zip pocket and mesh pocket. Separated warehouses of backpack interior, you can put different kinds of things into them Velcro design on the back for hydration compatibility (2l). You can hang trekking pole on the ring of backpack top and bottom The waist belts which can disperse the load to the lumbar area more effectively. It makes the backpack more comfortable. The inside pouches are made by waterproof material, wearable and durable. Perfect to use when hiking, climbing, riding and other outdoor outdoor activities