Open the zipper halfway (crucial for turning!). Pin the outer pieces together and the lining pieces together. Sew all the way around, leaving a small opening in the lining.
A zipper pouch is a versatile project that can be used as a coin purse, makeup bag, or organizer.
A standard nylon or metal zipper (about 14 inches or 35 cm is common for standard bags).
Sandwich the zipper between the outer fabric (face down) and the lining fabric (face up). The zipper teeth should be facing the outer fabric.