Nope, never carried a thermos, ever. I typically change all my dietary habits when doing big miles. I drink gallons of coffee here at home, but never crave it on the trail. If I had to have coffee (and I've made it plenty of times), instant works for me. Super light, no trash, no mess, good hot or not. There are some pretty good instants out there, but plain old Folgers coffee crystals works for me. I will sometimes bring a 1 Pt. Platypus bag with my favorite spirits for an evening nightcap.
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paul, texas KD5IVP