Title: Only for use in the car
Review: There is a major design flaw I wish had been mentioned in the reviews. This mug opens with the press of a button on the side. It is large and easy to press. If you are driving in the car and want a mug for the cup holder that you can easily open and then release to close, this is perfect. I wanted a mug I can toss in my workbag and not worry about spilling. Obviously the button could be pressed accidentally in the bag and it MUST be carried in my hand constantly to maintain it's no spill. It really needs a lock or a different mechanism.
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