Vacuum Insulated: The Simple Modern water bottle is double walled and vacuum insulated, which keeps your favorite beverage hot or cold for hours Take it With You: narrow mouth reduces spills and sloshing while you drink Built to Last: Take your durable stainless steel water bottle with you on any adventure! Whether you’re running on a trail, riding a bike, catching swell waves or playing sports, our hydro canteens are the best hydration companions.