Hands down the best thermos out there. Have used for hunting, fishing, camping, skiing. Will keep coffee warm for a longgggg time. Last time was about 6hrs in the 20s and coffee was still good to go. I think they say 8hrs at 32 degrees...
Use the smaller versions for coffee, tea, etc. Use the bigger ones for soup.
Have used REI, LLBean, GSI...this one is the best. The ONLY other 'thermos' I would say compares to this one is the yeti rambler, BUT, the yeti comes with a garbage lid that has a hole in it like a regular Starbucks coffee lid, which is good if you're sitting at a desk but utterly useless in any other situation (and I'm a huge fan of yeti coolers).
Tip- just like anything else used to insulate, you gotta prime this guy. Don't leave it in your truck overnight then fill it when it's ice cold and expect it to keep coffee cold all day. Sleep with it, fill it with hot water first, keep it inside...whatever u gotta do but get the inside warm before u use it