Zojirushi Stainless Steel Vacuum Mug is designed to drink directly out of the mug. Keeps your beverage hot or cold for as long as 6 hours. Lightweight, durable and economical. The flip-open lid has a safety lock that prevents the lid from opening accidentally. The SlickSteel finish interior resists corrosion and repels stains. Stopper disassembles for thorough cleaning.