Klean Kanteen Wide Mouth Insulated Stainless Steel Bottle with Leakproof Loop Cap Wide 2.125" (54mm) opening fits ice, easy to fill and pour Compatible with most backcountry water filters Doesn't retain or impart flavors. Slim design fits most cup holders. Double-wall vacuum-insulated construction keeps contents hot 8 hours, or iced 24 hours Includes Klean Kanteen Wide Mouth 12 Ounce Insulated Stainless Steel Bottle with Leakproof Loop Cap