Thermos Vacuum Insulated Food/Beverage Bottle Thermos vacuum insulation technology locks in temperature to preserve flavor and freshness to keep beverages hot for 12 hours or cold for 24 Durable 18/8 stainless steel interior and exterior withstand the demands of everyday use Large mouth opening makes filling and cleaning easy; Pouring lid opens with push button ease and locks closed for carefree travel Built-in stainless steel cup and plastic sharing cup let you serve beverages anywhere Detachable shoulder strap makes it easy to take beverages with you