If you're plunging into the backcountry, bring along CamelBak's M.U.L.E. NV. Efficient and compact, this system totes 100 ounces of liquid (more than 4 large water bottles) and 610 cubic inches of hauling capacity. Cargo space is wisely distributed and includes internal organizers for tools and gear. The ventilated back panel keeps you airy and the Dynamic Suspension harness delivers excellent support. Plus, the M.U.L.E. even has a weather-resistant electronics pocket and an XC helmet carrier.