Features Material: [body] 210 D nylon ripstop, [bottom] P600D polyurethane coated Volume: 10.6 x 22 x 4.3 in Waist Belt: yes Hydration Compatible: yes, 3 liters Reservoir Included: no Description Product Description In addition to its capacious main compartment, tool organizer, and accessory pocket, Evoc's FR Enduro Protector Hydration Backpack features ancillary pouches and external strap mounts to carry everything from sunglasses to helmets and protective gear. It also accommodates hydration bladders of up to three liters, so you'll have enough water to take advantage of the pack's all-day flexibility.