Enjoy your favorite cold or hot beverage on the go with the Hydro Flask® 40 oz. Insulated Water Bottle! Double wall vacuum insulation ensures that your cold beverages stay cold for up to 24 hours and hot beverages stay hot for up to 12 hours. Featuring a wide mouth opening, the Insulated Water Bottle is easy to clean and makes it easy to add ice or fruit. The durable 18/8 food-grade stainless steel is BPA-free and odor and bacteria-resistant.