We prefer to use handbag zippers in these bags because of the extra width on the zipper tape and their durability. One 30” double-slide zipper will make both bags.
To use: Move one pull to each end of the zipper. Mark a line across the zipper tape 14” from the zipper stop on the bottom. Stitch across the tape along the marked line; stitch another line ¼” away from the first line. Cut the zipper between the stitched lines to make one 14” and one 16” zipper.