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.