The Stanley The IceFlow Flip Straw Tumbler - 20oz is a sturdy cup for ice-cold hydration throughout the day. The large handle is prepared for a full grasp when on the move while folding down and out of the way when you're settled in the car or at your desk. The 18/8 stainless steel is tough enough for the busy days and it's backed with double-wall vacuum insulation to keep the water inside nice and cold (up to seven hours, 35 if iced). Flip the straw and take a drink.