カレッジトレックタンブラー

The tapered bottom fits my car's cup holder perfectly, and the flip lid hasn't leaked once during my commute. I've already used both of the included straws, and they're a nice bonus.

The double-wall insulation actually works—my coffee stayed hot through a two-hour lecture, which is more than I can say for my old mug. The flip lid seals tight enough that I tossed it in my bag without a second thought, and having two straws means one’s always clean.

The flip lid seals tight enough that I tossed it in my backpack with zero leaks, and the double-wall insulation kept my coffee hot through a two-hour lecture. The two straws are a nice bonus for switching to cold drinks, and the tapered shape makes it easy to grip on the go.