My grandkids gave me a very pretty, very expensive mug for Chirstmas a couple of years ago; microwave safe and all the rest of it. It holds one quart. I make it every day for breakfast and sometimes have two mugs around breakfast time. Sweetened with Sweet-n-Low, it sure doesn't have any laxative effect; quite the opposite. But if I go out pistol shooting in the morning, the front sight is dancing around so much I can barely see it. Have to try the decafeinaed stuff when I plan to go out to the range.