Takeya ThermoFlask 2 Pack 40 oz, stainless steel vacuum insulated and double walled. Prevents outside temperature from affecting the inside. 18/8 stainless steel - prevents rust. Solid loop handle makes it easy to carry your favorite beverage while traveling. Easy drinking spout with retractable lid. Wide opening for ice cubes. Keeps cold up to 24 hours; 12 hours of heat.