The Stanley 30 oz. IceFlow Flip Straw Tumbler will help you stay hydrated in fully functional style. Whether you're upping your water intake at home or in the car, the built-in flip straw is made for easy-breezy sipping. Snap it shut and the double-wall vacuum insulation keeps your drink cold and leak-free for hours, while the folding handle allows for fast grab-and-go.