Perfect for popular water enhancers, powdered beverages, and iced coffees and teas, this Contigo Shake and Go Tumbler - 20oz. provides an easier, no-mess way to prepare and enjoy your favorite drinks. The patent-pending Autoclose technology offers leak-proof shaking and mixing so you never have to stir with your straw (or finger) again. The double-wall design and shatter-resistant, BPA-free Tritan allows you to simply make it, shake it and take it. Gender: unisex.