Hydro Flask is a classic 24oz bottle that is easy to carry around. With a simple silhouette and beautiful coloring, you will want to use it every day. Made of durable and rust-resistant 18/8 stainless steel that is used for flatware, and the double wall stainless steel vacuum construction protects the contents without transferring heat from the outside. This will keep your drinks cold for 24 hours, hot for 6 hours, and hot for a long time.