Black Diamond Revelation AvaLung Backpack Built-in avalung system significantly extends your fresh air Supply in case you're caught in an avalanche and buried beneath the snow A-frame only ski carry style keeps the tails of your skis away from your feet when you're kick-stepping your way up a chute Padded, adjustable swingarm straps are linked on the bottom with a cable so they move in concert with any body movement ICE tool pickpockets and crampon patch give you Quick access to your specialized mountaineering tools Avalung mouthpiece and tubing stow away in the shoulder strap when Not in use, but are easy to reach