13 OZ Insulated Black Cat Mug

The leak-proof lock actually works — I threw it in my tote with a book and nothing got wet. The black cat design is subtle enough for the office but still makes me smile every time I fill it up.

Tossed this in my bag on its side and not a single drop escaped, which is more than I can say for my old tumbler. The cat face is what sold me though, it's subtle enough to bring to the office without looking like a gag gift.

Finally, a mug that doesn't leave a puddle in my bag—the leak-proof lock clicks shut so securely I can toss it in sideways without a second thought. The 13 oz size is perfect for my morning coffee commute, and the black cat design gets a smile out of me every time I take a sip.