Take the Klean Kanteen CLASSIC 20oz bottle with you on every adventure. The stainless steel bottle features Climate Lock double-wall vacuum insulation that will keep your drinks hot for up to 20 hours and cold for up to 50 hours. The Klean Coat finish is ultra-durable for longer-lasting quality. The electropolished interior has rounded corners for an easy clean. It comes with the leak-proof loop cap but the bottle is also compatible with all the classic caps.