This steel mug isn't an extravagant item, but rather something that you'd use every day. The Zojirushi mug was built to do two things only: keep hot drinks hot, and cold drinks cold. And it does it very well, at a very affordable price.
The mug can hold 16 oz of hot or cold beveage, has a compact design, and comes with a pictograph lock that won't allow for spilling like your run-of-the-mill coffee mugs. Not only that, it has a 5 year warranty on heat retention. (The good people at Zojirushi take their heat retention seriously.)
At $25, the Zojirushi is a no-brainer as your travel mug