Corkcicle Tumbler-Waterman Collection-Triple Insulated Stainless Steel Travel Mug, 24 oz, Waterman Black Corkcicle is the only authorized Seller of this product. Any other sellers are not authorized and will not be warrantied by Corkcicle 24-ounce insulated tumbler bottle by Corkcicle Stainless steel construction, vacuum sealed and triple walled Keeps beverages cold for 9 hours and hot for 3 hours Won't break like glass bottles so use where glass is not allowed