Stuff the Atomic Mountain Backpack full of the necessities - avalanche probe, spare pair of dry socks, Vitamin R, shovel, gloves, etc. - and get out there and explore. The Atomic Mountain Backpack is perfect for skiing or other daylong adventures. It's lightweight, roomy and has tons of compartments to hold everything you need. 600D polyester means it'll hold up during days when you go off the beaten path. All backpacks are not built the same. Experience the difference with the Atomic Mountain Backpack.