Fly Racing Hydro Pack The Fly Racing Hydro Pack comes with a 70 oz. bladder for sustained hydration during prolonged rides. It includes a high-flow rate bite valve, fully adjustable mesh shoulder straps, and two external pockets suitable for storing snacks, keys, wallet, etc. Reflective panels are incorporated for enhanced visibility. Features: 70 oz. bladder keeps you hydrated on those long rides High flow rate bite valve Fully adjustable mesh shoulder straps Two external pockets hold snacks, keys, wallet, etc Reflective panels