I like those tumblers that are wide enough and not very tall. They have two main advantages:
1. Harder to knock over. Wider base and all. Bonus points if they DON'T have a wider mouth than base.
2. Easier to wash. Ever have that stupid residue you can't get off with just a rinse? You have to stick a scrubbing sponge into it or something? Well, a wider mouth just makes it easier to wash.
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i get so angry sometimes i just punch plankton --Klinotaxis