WaterVault Double Wall Vacuum Insulated Sports Tumbler, 18/8 Stainless Steel Water Bottle, Flip Top Sipper Lid, 20 oz, Black Matte Double wall 18/8 stainless steel tumbler, vacuum insulated water bottle with stay open snap lid and leak proof snap closure; sipper lid, BPA and phthalates free; no metallic taste, non toxic food grade materials used inside and out Keeps hot beverages hot for up to 6 hours and cold for 12 hours; sweat proof, leak proof and rust proof under normal conditions; all the benefits of a thermos 20 ounce capacity (591ml) tough, durable and dependable with all the benefits of a thermos; will not sweat under normal conditions Perfect travel mug, fits most car cup holders; perfect for campers, hikers, at the gym, yoga class, at work, home or anywhere you need to stay hydrated; sleek modern design Hassle free 2 year manufacturer limited warranty; hand washing recommended, do not submerge, do not use cleansers containing chlorine; not suitable for freezing, microwaving or cooking uses