The best Thermos that I have discovered to date is the the Backpack Thermos by Thermos. This thermos really keeps things hot for 8 hours. I also love the lip that allows you to sip your liquid slowly to prevent burns. It has not had the leaking issues that I have experienced with other thermoses in the past, which is a huge bonus!
Whether we like to admit it or not, cold weather is around the corner, so this thermos is a perfect way to keep the chills away. You can put hot tea with gelatin and coconut oil in it, or you can even drink your homemade broth in it.
I got mine locally at Orange Tree Imports. They have a great selection of colors and a price point of under $30.