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Message: <blockquote data-quote="SG6" data-source="post: 1766097" data-attributes="member: 68155">Few years ago I was making some long trips occasionally and I wanted a flask. I looked round and saw 3 or 4 different makes. Eventually buying 2 of them.One day having little else to do I read articals on the Internet about some that were "excellent" at keeping the temperature. Then I came across them in an outdoor shop, and bought one.Now I had 3 different ones.More boredom and I decided to compare the 3. Cleaned each in hot water and filled each to the same place with boiling water, screwed top on and left for 2 hours.Lined them up, unscrewed and put a thermometer in each.The best was one of the cheapies from Wilkinsons, the expensive one was worst. Quick check and it appeared that the "problem" is the top. The fancy one have a big complex top bit that makes it easy to pour from but is a poor insulator. The "best" one had a simple screw top that insulated well.If wilkinsons still have them they are the stainless steel ones with a foam outer protector. Just make sure that the screw top hasn't become a fancy affair.</blockquote>