Osprey Packs Exos 48 Backpack Nylon Imported An internal sewn-in backpanel sleeve with clip attachment accommodates up to 3 liters of hydration The Exos peripheral frame is a 6065 aluminum alloy with an internal suspended cross strut providing excellent load carrying support The ExoForm sewn-in hipbelt features seamless layered mesh covered foam providing exceptional comfort, cushioning and load transfer. A removable floating top pocket with an internal key clip and under-lid zippered mesh pocket provides organization. Multiple cord tie-off points for the quick attachment of additional gear are located on both sides of the front panel on each Exos pack.