I have bought several shaving mugs and even a small (it loked bigger on the bay) scuttle and keep going back to a small bowl that is about the size of a latte cup. So my answer is go for the cup and save a few bucks that could be spent on other AD's.
Good luck and the Alcatraz cup sounds interesting.
All right, they're on our left, they're on our right, they're in front of us, they're behind us... they can't get away this time. [When Surrounded By 8 Enemy Divisions During WW2]