Rtic Stainless Steel Bottle (64oz) Designed to keep beverages cold for up to 24 hours and hot for up to 6, our water bottles feature double wall construction with an extra interior copper layer for superior performance. Constructed from premium grade, 18/8 stainless steel thats non-toxic, non-leaching and BPA free. 100% leak proof cap with a three finger grip. Extra wide opening for easy filling, drinking and cleaning. Vacuum insulated to keep liquids and beverages fresh.