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Designate one of the circles to be the back of your bag, and cut a slit that is 1/2" wide and 7" long down the middle of the circle. Try to find a zipper that is exactly 7" long if you can, but if you can't find one, you can use wire cutters and scissors to trim the zipper down to size (the wire cutters are to cut through the metal zipper section more easily). You can also adjust the length of the window you cut to accommodate a different size zipper.
Use the fabric glue to glue the zipper under the cutout so that the zipper fits perfectly in the window.