Deuter loaded the Women's Guide 40 SL with an array of mountaineering-specific features and gave it a slim, conical designed to fit the body of female athletes like a glove. A highly-customizable suspension system, multiple access options, and supremely effective back ventilation makes this bag a versatile choice for mountain trekking or backcountry ski touring. After a day of hauling a full load of gear with the Guide Backpack, you'll wonder how you survived all those previous trips with lesser bags.