21 oz. Përka Blackjack vacuum-sealed stainless steel double-wall tumbler with copper lining includes a clear slider lid, silicone seal and raised side grip. The tumbler can keep drinks cold up to 24 hours and hot up to 8 hours. The black tumbler is powder coated. A portion of all proceeds are donated to Shelter to Soldier™, a non-profit organization that rescues dogs to train as service animals for veterans in need.