Polar Camel 12 oz. Purple Stemless Wine Vacuum Insulated Tumbler w/Clear Lid. 12 oz. Stainless Steel Polar Camel Tumblers features double-wall vacuum insulation with a clear lid. It is 2X heat & cold resistant compared to a normal tumblers and is BPA and lead free. Polar Camels are made from 18/8 gauge stainless steel (18% chromium/8% nickel) – also known as Type 304 Food Grade.