I've used a good number of travel mugs and I've been disappointed an equal number of times. That is, until I discovered the Contigo West Loop v2 travel mug.
- they dont keep your drink hot for long enough to be useful
- they are too fragile
- they spill
- they leak
- they are hard to clean
In my opinion, to be a great travel mug, your mug needs to hit ALL of these points, not just some. The Contigo is rated to keep your coffee hot for up to 5 hours, well, it keeps it warm for 5 hours, but hot for 3 - and that's fine.
It is built like a tank, using food grade stainless steel and possibly the best quality lid I've ever used. It employs a firm Autoseal button so your coffee doesn't spill and opens only when you are sipping your coffee. It also has a lock function so you can toss it in your bag if you want.
The lid is VERY easily cleaned; they've designed the lid so it will release the entire internal mechanism onto a hinge so it can be rinsed out clean - AWESOME!