Thermos insulated flask will keep you hydrated throughout your day. Our double-wall flask versatile design is optimal for indoor or outdoor use. Whether you are in the office, on a hike, gym, or yoga POP design keeps your Hydro On! Looking for a great gift idea? Our vacuum-sealed hydro flask bottles make a perfect gift for women, men, and best for kids too! Available in Steel, Black, and Teakwood - 17 or 25 ounces.