wrote in message
...
The stainless thermos is not the same as a vacuum flask,a good vacuum
flask will keep water at a higher temperature for 24 hours,the stainless
only keep hottish for 8 to 10 hours,if you read carefully you will see
that stainless thermos never say it's a vacuum flask otherwise trading
standards would be straight on to them.
hope this help Alan231

Aren't stainless steel flasks vacuum flasks - the only difference being that
they are made of metal rather than glass which is more fragile. Or do steel
flasks have insulation padding between the inner and outer skins, rather
than a vacuum?