For your next alpine ascent or hut trip, haul everything you need in the Backcountry Access Stash Alp 40 Backpack, and you wont have to worry about your hydration system freezing. The Alp 40s stash storage systems new Outlast phase change materials actually store heat from your body and release it when the temperature drops, warming the water when youre not moving. The system is also Nalgene compatible, which eliminates the hassle of cleaning out a bladder. Simply fill a Nalgene, unzip the long, storm-proof side zipper, and attach your Nalgene bottle to the included adapter. The Alp 40s convertible compression straps dont discriminate between skis or a snowboardcarry a board vertically or your skis A-frame style. Load your probe and shovel handle into the easy-access external pockets, safely store your ice tools in the burly hook-and-loop straps, and attach loads of other gear onto the daisy chains.