The most functional and comfortable insulated Flask ever! Our new Ergological-shaped SpeedDraw Flask with Fire & Ice technology allows for the most natural grip possible and easy-squeeze access to fluids. 18 oz / 535 mL double-wall insulated and hi-viz reflective SpeedDraw Flask with Race Cap offers quick bursts of fluid and keeps liquids cooler longer. Fully adjustable hand strap with thumbhole enables grip-free running. Large, expandable, zippered pocket carries phone, keys, ID and other running essentials.