I have tried others but they fail. This is by far the best travel mug available. BART (Bay Area Rapid Transit) approved. Push the button and drink. Go ahead and drop it! This travel mug will not leak when the button is not pushed.
Note: As you place the lid on this travel mug; press the lid’s button. Otherwise you get a nice little splash if you don’t. (It pressurizes it if you do not press the red button.)