I may have had a zipper epiphany. A zippiphany, if you will. And it all happened while experimenting with this little pouch:
Cute enough, right? Although I feel a little bit sorry for the poor red birdie on the ribbon who got his beak smooshed in the seam allowance. Oh well. But look at corners by the zipper ends. Not nearly as wonky, angled, not-crisp-cornered as my previous pouches. This makes me very happy!