Osprey designed the Alpine 3L Pocket to specifically store sharp spikes, ice screws, and crampons, but since it attaches to any backpack, you'll end up taking it on more adventures outside the icy world. It can store avalanche safety gear on backcountry tours, an extra rack of cams, and bulky backpacking gear like bear spray, tent stakes, or dry food. Double diamond ripstop fabric protects your rope and harness from crampons and screws. The compression straps attach to the front of any Osprey backpack, and they convert to shoulder straps when you're jonesing for a quick hike after work.