ROAD RUNNER SPORTS FULL THROTTLE BOTTLE PACK 21 ounce :: Stay hydrated without stalling your run with the Road Runner Sports Full Throttle Bottle Pack. You'll love this belt-based hydration system that features a single 21 ounce insulated bottle to keep your water fresh and cool for the long haul. You'll taste the water not the bottle thanks to the TruTaste(TM) liner and quick and easy sipping will be a snap complements of the Full Throttle Bottle's "always open always shut" self-sealing Jet ValveA(R).