I have had a few Stanley flasks for work . My flask is used every day and if you get one that’s made in the USA there ok but a lot are now made in China and don’t keep hot for long ! I now use a stainless steel flask from IKEA that cost about £10 that works much better.
I just checked and both my Stanleys are made in China. They keep water hot for stupidly long. Like if I make a flask at 04:00 it's still too hot to drink at 18:00.
I don't bother pre-heating the flask any more, it doesn't make that much difference. I suppose they would keep stuff hotter for even longer if I did.
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