>>2140545This is the real answer. I love them and have probably too many. I would never bring one on an actual trip that did not involve a car. I have a few Dutch surplus ones that are EXCELLENT. They are modern manufactured and will legit keep your drink piping hot for a day. No bullshit. I have many and this is the best I have found. I would never bring one in a pack though, just way too large. I got mine in new condition in the USA at a surplus store but here is one I found online:
https://www.surplusandoutdoors.com/thermos-flask-dutch-military-issue-olive-flask-complete-in-used-good-condition-1404984.html 