This coin purse have the zipper at the center. So that when you need money just unzip it and open it by pressing opposite edge of the zipper with your palm and fingers for it to open.

For this wallet we need:

1) A cloth or some water proof material like that of backpacks, size 4" x 5".

2) 5" long zipper and its slide.
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How to make it is tricky, if you are unable to visualize the procedure, because you have to see the other DIY to understand what I am talking about.  (I am sorry for failing to document the procedure, I was caught up in the moment.)

Procedure:

1) Sew the zippers at the 5" sides. On opposite sides.

2) Insert the zipper slide.

3) Turn it inside out and sew both the open sides.

4) Reverse the coin purse to reveal the finish project.
Picture