Deuter ACT Zero 45+15 SL Hiking Backpack nylon BY WOMEN, FOR WOMEN - Women's specific fit, designed by women for women with a shorter adjustable back length, narrower shoulder harness and conical shaped hip belt AIRCONTACT LITE SYSTEM - A body contact back design keeps weight close to the body for effective load transfer with breathable padding made of open cell hollow chamber foam and an anatomic X-frame of aluminum stays ADJUSTABLE - Vari Quick adjustable back length fits torsos between 14 and 19 inches COMFORT & STABILITY - Ergonomic Comfort Lock hip fins of dual density foam custom fit by adjusting to each wearer for load stability EXTRA ROOM - Extendable 15L pack collar with optional roll top closure; Removable 15L lid converts to summit pack