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With the right sides facing together, stitch the side seams of each piece of fabric, leaving the top as an opening. Miter Turn "one" pouch right side out. Add pockets.
This should create the shape of a pouch. the lower corners of each pouch to add support. This will become the "outside" of the bag. The other pouch will become the "lining". Add these to the "outside" of the bag or the "right" side of the lining.