Lowe Alpine created the Attack 25L5L Backpack for climbers, hikers, bikers, backpackers, trail runners, and students. Thanks to a compact design, it also makes a great in-bounds ski pack. The Attack sits high on your back so it stays out of the way of your climbing harness and so you can sit on the chairlift without taking it off. A 1525cu inch main compartment holds some quickdraws, layers, snacks, or your books. The Attack Backpacks bottom expands to hold another 300cu inches of whatever, so you dont have to start strapping stuff to the outside.