Wow. I just joined the list and already I have a surprise! Thanks.
OK, here are my initial thoughts.
1. I can see the case for making it smaller (credit cards and pocket) or larger (wallet), but overall it is a good size. It will be great for my id in my bike bag.
2. I cannot see a divider in a bag this small.
3. It looks as though the clip can be removed from the ball. I second the idea of a circular ring.
4. A smaller zipper would be nice, but the larger zipper is easier.
5. Smaller piping would be nice, but maybe too much trouble (expense).