I love this mug. It does not spill a drop. I can't emphasize that enough. I am a clumsy girl and drop things constantly. A mug like this is amazing. Once I lock the push-button, I'm good to go! I can throw it in my car cup-holder or even inside my tote bag and I never have to worry. And it holds 4 cups of coffee, which is essential for me in the morning! Just make sure you always twist off the suction disc to clean the top thoroughly.