Arc'teryx breaks new ground in hydration pack comfort and portability with the Chilcotin 20 Hydration Pack. Compact and accessible, this pack features a unique Wingman design that makes it easy to navigate technical trails with a full pack. While the waist belt disperses the pack's load securely, the Spacermesh HD shoulder straps cushion the drag on your shoulders to prevent soreness after hours of hiking. The shoulder straps and back panel also utilize an Aeroform mono filament mesh to promote air flow throughout the contact patches. In addition to the main compartment, the Chilcotin also sports an inner security pocket, for your wallet or keys, and two Wingman pockets on the waist belt, easily accessed without removing the entire pack. Extra climbing equipment, wet clothes, poles, or daisies can be securely attached to the external gear straps for overflow storage options. If you are one who enjoys a good nocturnal excursion, then you'll appreciate the highly visible reflective tabs, an upgrade in safety and confidence. The two liter, BPA free Widepac closure Source reservoir is easy to clean and antimicrobial. When not in use, the locking bite valve can be mounted on the shoulder strap to keep it in easy reach. A reservoir this size should provide enough liquids for about two hours of intense aerobic activity in hot weather.