Step 1: Place seven 7-inch-long zippers face-down on your work surface, positioned horizontally with the long sides touching. Each zipper pull should be on the opposite end of the one before.
Step 2: With right sides facing, pin together the top edge of the bottom zipper and the bottom edge of the zipper above it. Working up, repeat this step until all the zippers are pinned together to form a rectangle. Using matching thread and removing the pins as you go, machine-stitch the zippers together, leaving a ⅛-inch seam allowance. Then, snip away any excess thread and iron the seams flat. Open the center zipper one inch.
Step 3: Cut a 6"W x 8"L rectangle of coordinating fabric. Position the zipper rectangle on the fabric, right sides facing. Pin all four edges, then sew, leaving a ¼-inch seam allowance. Trim away the zipper tape ends and any excess fabric. Finally, fully open the zipper from Step Two, turn the bag right side out, and iron the seams flat.