Mighty Mug Plastic Travel Mug, No Spill Double Wall Tumbler, Cold/Hot, Cup-Holder Friendly, Dishwasher Safe, (Black, 16oz)

The won't tip over mug is powered by our innovative and patented smart grip technology. Simply place the mug down on your desk and it creates a powerful airlock which allows it to resist accidental knocks to help avoid spills. When you lift the coffee mug the pressure is instantly normalized allowing the airlock to release and the mug to lift naturally. You need to try it to believe it.