The Rebel Tactical RT452 3-Day Survival Backpack is made of a strong and durable nylon construction that is built to withstand daily use in any outside. Originally designed for military use this durable assault pack has a variety of features such as a double stitched MOLLE system so you can add enough gear and supplies to last a full 72 hours. The mesh padded back panel can hold up to a 2.5 liter hydration bladder (bladder not included). Reinforced contoured shoulder straps are constructed with mesh padding and are also fully adjustable. Four compartments for large amounts of storage, and one hidden side compartment located at the back of the bag.