GULPZ™ Personal Hydration Products With a 70 fl. oz. (2 liter) fluid capacity, our GULPZ™ Personal Hydration System helps you to take in essential fluids while working, or playing in the heat. Whether hiking, biking, climbing or running, stay hydrated with our hands-free GULPZ™. Personal Hydration 6801 GULPZ™ Personal Hydration Systems Hands-free convenience; stay hydrated and refreshed at work and at play 70 fl. oz. (2 liter) fluid capacity; nylon outer Black, Hi Viz Lime, Desert Camo Include water bladder & drinking hose w/valve