Cut out fabric as indicated in the supply list
Reinforce all exterior fabric and one interior side
Use one (1) of the top interior and top exterior strip to flank one long side of the 12-inch zipper. The zipper should be placed between the interior and exterior strip (their right sides facing each other). Sew straight along the edge. Repeat on the other side.
Attach the bottom interior and exterior strip to the short side of the zipper created in the last step. On one edge, attach loop (strap material) into the seam. None of the seams should be visible. The attached fabric should be placed around the zipper with their right sides facing each other.
Take the interior and exterior pocket cutouts (bottom and top) and sew along the 8-inch zipper. The right side of the corresponding pairs of fabric should be facing each otherwhile enclosing the zipper. Sew straight along the edge. Repeat on other side with the remaining pair of fabric.
Take a non-reinforced interior side and the exterior side, pin to the loop made from the strip (with zipper) and sew with the seams visible on the outside. Trim seam.
Take the interior fabric, reinforced interior fabric, and prepared pocket and pin to the open side of the loop. Sew with the seams visible on the outside. Trim seam.
Take the edge strip of the interior fabric, fold edges and enclose the seams along the sides to hide the visible seams.