The Stash pack is a great winter backcountry hydration pack. It features one large main two-zipper access compartment, an internal zippered security pocket with car keys holder clip, internal probe and shovel pockets (seperate from the large main storage area), a large screw-top cap-covered reservoir opening, external webbing for lashing on extra gear, an insulated hose in the zippered insulated compartment in one shoulder strap, buckled waist belt and sternum strap, ski holder straps, and a large webbing carry handle.