[Porsche-O-Phile]

+1 on Contigo (think it's the "Contigo Extreme", about $20-$25).

Holds up well, doesn't leak. AND the handle has an integrated clip / hinge point so it clips onto my laptop bag so I have both hands free walking around - big bonus.

Keeps coffee warm in single-digit temperatures for over an hour. That's pretty good. The only one I've seen better is a funky space-age one I have with a vacuum chamber in between the inner and outer walls as well as a thermal break where the two shells connect to the bottom and top rings - pretty expensive and no clip handle. I bought it about 20 years ago for maybe $30 or so (probably would be $100 now). That sucker will keep drinks warm for 6-8 hours in a freezing cold car - kind of amazing.