So, no. I'm not going to write a zip pouch tutorial. Instead I'll just show you just the portions which I do differently.
|The top of the zipper|
|End of zipper|
When sewing the side seams where the top of the zipper is, you need to make sure the seams of the outer fabric and lining MATCH UP.
When sewing the side seams where the bottom of the zipper is, you should avoid catching the zipper ends.
Yep, that's it. That's my secret ingredient.