Perka Lennox 18 oz Double Wall Stainless Steel Bottle. With its 18 oz. capacity and double wall vacuum insulated construction, this bottle will keep your hot drinks hot for 12 hours and cold drinks cold for 24 hours. The Lennox has a hinged handle on its natural bamboo screw-top lid for easy carrying and its durable and sweat-proof powder coat finish protects your hands and the bottle.