Men's CAMELBAKA(R) CIRCUIT VEST 50 ounce :: Nothing's holding you back with the revamped Camelbak Circuit Vest 50 ounce fueling your run. Your best bud on distance workouts this quick-stow compatible vest features a Crux(TM) reservoir with space for an extra 50 ounces of H2O on the go. Clocking in at a pack-friendly weight of 5 ounces you'll love the spare pockets and bounce-free fit.