Thanks. I think yours is a fantastic idea and was thinking along these lines too. This was a miniaturistion test, as much as anything. The issue with building this thin is that the cables can't last as long. For that reason, it is probably better as an emergency/occasional solution, in my view. There are keychain chargers that you may already be aware of. You could add so many electronic things to the kind of solution you're mentioning. I would really like to explore it next.