Osprey Reverb 18

The 18-liter Reverb is sleek and inconspicuous, but it packs a lot into a small frame. There are pockets for avalanche safety gear and goggles, as well as a zip-away hydration sleeve. Plus, you can strap on skis or a snowboard for hikes and still access the main compartment through a big back panel. [$99; ospreypacks.com]