First, tear off 4 strips of duct tape that are 9 inches long. Layer them sticky side up with 1/2 inch of overlap between each piece. Then, tear off 4 more strips the same length. Stick these to the sheet you just made, but start about 1/2 inch down from the top.
Fold the edges over. Then, use your utility knife to trim both ends of the sheet. Your finished width should be 8.5 inches, and it should be about 6 inches tall.
Tear off two 5 inch strips and layer them. Then, stick two more 5 inch strips to the back and fold over the edges following the same procedure as the main body of the wallet. Trim the edges with the utility knife and ruler so that this pocket measures 4 inches wide. Tear off two 9 inch strips of duct tape, and stick them back-to-back. Cut this piece into two pieces that are each 4 inches wide.
Tear a strip of duct tape in half lengthwise to make trim for the top of these pockets. Fold the trim over the top of the pockets and trim off the extra. Lay the three pockets on top of each other, with the largest pocket on the bottom.
Lay out your main fabric attach the credit card pockets to the upper right with a 9 inch strip of duct tape torn in half lengthwise. Then, fold the wallet in half and secure the ends with strips of tape that have been torn in half lengthwise. Trim off the extra. Add a final strip of tape across the bottom of the wallet, and you’re done!