It's weird to me that neither of these seems to exist:
- A double-walled/insulated pouring kettle
- A cap for any of the popular insulated water bottle brands that's designed to be suitable for pourovers
I know that almost everyone in fancy coffee land uses a Fellow Stagg or knockoff, and a lot of the standalone non-electric kettles are coming from Japanese companies and designed for recipes that use lower brewing temps anyway.
Still it seems like there would be a market for the former in commercial settings and the latter for the "coffee outside" people. I wonder if the thing preventing insulated pouring kettles is that they're afraid people would try to use them on a stove?
(There are definitely vacuum bottle lids that are designed for pouring through, but most are pretty bad at it.)
On the other hand if you don't care about temperature retention, check out these cute colored plastic ones from Hario: