Ultraspire’s Ribos pack lets you wield your water bottles like the dual six-shooters of a gunslinger. The lightweight harness system combines the patented Molecular Belt System with front vest pockets and a large zippered back pocket, so that you can carry all of your food, keys, cash, and even extra layers in separate, handy compartments. The Ribos’ distinguishing feature is the hydration system, which consists of two 26-ounce bottles set into holsters on the back of the pack, rather than a larger reservoir. The low-slung bottles provide a lower center of gravity, meaning less weight, contact, and subsequent sweat on the upper back.