"J. Clarke" wrote in message

Another alternative is the Nissan Thermos JCE350, which has the advantage
that (a) it keeps cold drinks cold, (b) it keeps hot drinks hot,

Like hell it does. I put my hot coffee in there one morning, then some
cold soda on top for a break later in the day. When I opened it an hour
later, they were both about room temperature. And the layers got mixed too.