Really like that Richard, I thnk I'd like something like that for my plain old stainless flask, probably wider diameter and twice the length. Don't suppose you can price something up?
Thinking more about it, no handle required as there is one on the flask, the leather would need to be trimmed around the handle, and I guess the stitching can be in the same area. A cup type hood would be an idea for the top though, save the pourer from knocks and help with some insulation, not for drinking from though.
I'd drop it round if it's convenient.