Our 40 Oz tumblers are the perfect companion to any adventure. The double-wall vacuum insulation ensures your beverages stay cold up to 24 hours and hot up to 12. Its 18/8 stainless steel construction makes it tough, while its BPA-free materials ensure quality and safety. Our tumbler is the perfect complement to our HydroBag Handle! * Double-wall vacuum insulation * Keeps drinks cold up to 24 hours, hot up to 12 * BPA free