The Perka® Roak 304 stainless steel bottle has a double wall construction with vacuum seal and copper lining for added insulation. This bottle features a ridged grip for easy handling and a stainless steel twist off cap with silicone ring. The exterior is powder coated to reduce sweating and the cap has a hinged steel carry handle for easy pick up. Liquids stay hot for 12 hours and cold for 24. FDA Compliant and BPA Free.