The 30 oz. Everest copper-lined stainless steel insulated tumbler is a BPA-free, vacuum insulated stainless steel double wall tumbler. and keeps beverages hot for up to 8 hours and cold for up to 18 hours. The spill-resistant slide closure lid with a rubber gasket. This makes a great insulated travel mug, employee gift, trade show giveaway, and makes a great advertising piece for colleges, booster clubs, customer thanks, and so much more. Commuters will thank you for this travel tumbler. Holding 30 oz. of liquid this comes in several smooth matte and a shiny steel color and can be imprinted with several options.