RotopaX are the only rotationally molded EPA and CARB compliant containers available for sale in the United States. This is thanks to a patented three layer Roto-Molding process, along with specialty formulated plastic barrier material to meet the governments new extremely low permeability requirements. Rotopax water containers are rotationally molded and great for storing any potable liquids as well as being frozen for nice cold water all day long. However, the plastic compound is a food grade plastic so it is safe for drinking.