The CamelBak Stoaway turns any pack into a winter hydration system. . Fully insulated reservoir with double the insulation of a summer pack. Quick zip reservoir loading, includes 4 mm insulated tube with quick link. CamelBak Big Bite valve and insulated tube cover. Antidote Reservoir features Quick Link system to make removing and reading your reservoir simpler. Center baffling in the reservoir keeps the profile low and offers unmatched stability. Lighter weight fill port, hanging accessory, and fold out drying arms.