Our 20 oz. Stainless Steel (powder coated) Polar Camel Bottle features SureGrip ridging and double-wall vacuum insulation with a clear lid. It is 2X heat & cold resistant compared to a normal travel bottle 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.