For your next alpine ascent or hut trip, haul everything you need in the Backcountry Access Stash Alp 40 Backpack, and you won't have to worry about your hydration system freezing. The Alp 40's stash storage system's new Outlast phase change materials actually store heat from your body and release it when the temperature drops, warming the water when you're 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 40's convertible compression straps don't discriminate between skis or a snowboard—carry 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. Material: 150D honeycomb, 210D high-tenacity nylon Volume: 2440cu in (40L) Suspension: Framesheet and aluminum stays Waist-belt: Yes, padded Hydration Compatible: Yes, comes with Nalgene-compatible hydration system Rain Cover: No Access Types: Top, side External Pockets: External wand pockets Snowboard Carry: Yes, vertical Ski Carry: Yes, A-frame Gear Loops: Daisy Chains Ice Axe Loops: 2 Shovel Pocket: Yes Weight: 50oz (1417g) Recommended Use: Single-push alpine climbs, hut skiing, backcountry day tours