Shop Klean Kanteen 20 oz Kanteen Wide Insulated. Do you need your iced mocha to stay frosty for hours? Want your homemade chili to still be hot for lunch even though you poured it in seven hours and 4,000 vertical feet ago? With double-wall, vacuum insulation, the 20oz Kanteen keeps contents hot up to six hours and more than 24 for iced. Made from high quality, 18/8, food-grade stainless steel with a 100% stainless interior, it won`t retain or impart flavors.