Osprey Variant 52-Liter Backpack The expedition suspension featured on all Variant Series packs consists of a removable HDPE frame sheet and aluminum peripheral rod Each Variant Series pack features a removable/interchangeable EVA foam hip belt with modified straight Ergo Pull closure Dual side pockets provide secure storage and easy accessibility to wands, pickets and other longer items A sewn-in hydration sleeve located on the inside of the back panel accepts up to a three liter reservoir Floating, removable single compartment top pocket with internal key clip and under-lid zippered fabric pocket keeps often needed items organized