The tough and top-performing Perka® 51 oz. Rover Growler has a double wall stainless steel vacuum insulated construction that will keep your drink cold for 72 hours and hot for 30 hours. The lid has a handle for easy carrying and it doubles as a 12 oz. drinking mug. The lid/cup has an 18/8 stainless steel liner and durable polypropylene outer wall. The sweat-proof powder coated bottle finish provides a non-slip grip and durable protection from bumps and scrapes. The Rover Growler is sure to become your favorite companion for hiking, camping or any outdoor excursions. FDA compliant and BPA Free. A portion of all proceeds is donated to Shelter to Soldier™, a non-profit organization that rescues dogs to train as service animals for veterans in need.