Black Diamond Anarchist AvaLung Pack I purchased this item new through this app, but I am selling it because I never had the opportunity to use it. Although it is unused, there may be some scratches from storage, and the "availing" lettering on the shoulder strap is faded. This is a backcountry backpack with two compartments. The exterior has storage for avalanche gear, and the rain cover has a pocket for goggles. It is equipped with AvaLung technology, which allows you to breathe air from within the snow in the event of an avalanche burial.