Osprey Reverb 18

The 18-liter Reverb pack is small enough to stay out of your way on runs but stuffs a lot into its small frame. There are compartments galore, including a dedicated goggle pocket and an insulated zip-away hydration sleeve. Plus, you can strap skis or a snowboard onto the back for hikes and still access the main compartment through the pack's back panel. [$99; ospreypacks.com]