Military tactical backpack size: 13" x 20" x 11" / 33 x 50.5 x 28cm (W x H x D). Capacity: 40L. The military backpack is made of 600 x 600 density fabric, which is durable and water-resistant. The MOLLE tactical backpack features a MOLLE system, with MOLLE webbing throughout, allowing for the attachment of additional tactical pouches and gear as a 3-day assault pack bag backpack or combat MOLLE backpack. Assault pack backpack, double-stitched, heavy-duty zippers and utility-style cord pulls, side and front load compression system, breathable mesh padded back area and shoulder straps, breathable and comfortable. The military backpack is ideal for a hydration bladder (hydration bladder is not included in the backpack) as a hydration backpack or outdoor camping hiking backpack. This tactical assault pack backpack can be used as a 3-day assault pack backpack, range bag, hunting backpack, survival backpack, army backpack, trekking backpack, or daypack for daily use.