A question for owners who have been using a thermos for more than a month or two. How do they keep warm over time. I bought thermoses of different brands that work from a week to a couple of months, then you can throw them away. There is a thermos from the beginning of the 80s, apparently killed in the trash, the lid is lost, but it keeps the heat easily for a day. But it weighs 1.2 kg. And all these are like foil 0.5-0.7 kg, even the most expensive ones. Could this be the reason?
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