Collegiate Trek Tumbler

The flip lid really is leakproof—I tossed it in my tote sideways and not a drop escaped. Double wall insulation kept my iced coffee cold through a three-hour lecture, which is exactly what I needed.

The tapered bottom fits my car's cupholder perfectly, no more wobbling on morning commutes. Flip lid seals tight enough that I tossed it in my gym bag with zero leaks, and having two straws is a nice backup.

The double-wall insulation actually keeps my coffee hot for hours on campus, which is rare for a cup this size. The flip lid snaps shut securely, so I can toss it in my backpack without a second thought. And the two straws are a nice bonus for when I switch to a cold drink.