20 liters is a common choice for a daypack. With Osprey detail and carrying comfort, this is a sure-fire choice in its size category. The carrying system offers great freedom of movement in a multitude of sports. - Carrying system optimized for women: the shoulder straps and hip belt are contoured for female anatomy - HDPE back panel structure, with EVA padding: the AirScape panel feels comfortable - Stretchy BioStretch shoulder straps - Electronics and sun glass pocket with a soft liner - Zippered hip belt pockets - Stretchy kangaroo pocket in the front panel - Shoulder strap pocket - Stretchy side pockets with InsideOut compression - Holder for ice axe - Chest strap with a whistle in its buckle - Well-padded hip belt - Pocket and ports for the separately available hydration bladder and its hose - Led holder for cycling (led not included) - Reflective detail - Fabric: 100 x 210 denier bluesign certified, recycled Nylon PFC-free product.