simply simily. Insulated Water Bottle Built in BPA Free 18/8 Stainless Steel Double Walled Vacuum Insulation - Perfect Cycling Any Outdoor Sports - Fits in Bicycle Water Bottle Cage - 17 Oz Premium food grade 18/8 stainless steel with classic twist cap BPA free, non-toxic, lead-free and packed in a friendly case 17 oz. of liquid capacity, an ideal size to fill up with your favorite beverage Keeps liquid hot for 12 hr. and cold for 24 hr. so you can enjoy your drink anywhere at an ideal temperature