This is the model hand I got for when I sell wristwarmers at the craft fair next year:
It is a bit of a production getting the warmer onto the hand, as the fingers don’t bend, and are in that splayed position.
This is the kit Aunt Judith and Uncle Peter got me:

The Kureyon colourway is #52, and a very beautiful one. Aunt Judith says that she has made one of these bags already, and it worked well. Hers is only lightly felted; I think I may felt mine a lot, I like a good strong bag. The company’s website is here. It is a very nice kit, everything you need except the needles. I love the handles, they’re copper wire just bent into a circle and joined, but it will solve that age-old problem of icord handles stretching and sagging. I won’t be able to put it over my shoulder, but that’s fine.
The only thing worrying me is that in the instructions, you put it all together before felting, so the metal handles go in the washing machine. That can’t be good, can it? I understand why: you sew the handle strips around the handles, and then it felts to the proper size, but I’m worried about the washing machine.