This 887 ml / 30 oz Rambler Tumbler is designed to keep hot drinks warm and cold drinks chilled. Crafted with kitchen-grade stainless steel and double-wall vacuum insulation, your drink remains secure. The included MagSlider Lid has an added magnetic element for extra protection, but is not leakproof and does not always guarantee no spills. This tumbler is available in stainless and DuraCoat colors that won't fade or crack.