Rip a strip of tape at least 10 inches (295 mm) in length and place it sticky side up on your working surface.
Then, rip a second piece of equal length and place sticky side down halfway over the first strip. Fold the rest of the strip facing up over the second strip.
Flip over the two strips and place a third strip sticky side down covering the remaining sticky part of the second strip. Flip the sheet again and continue extending the size of the sheet until you’ve created a large sheet of duct tape that is 8.5 inches (215 mm) by 7 inches (175 mm).
Trim all the edges.
Fold the wallet in half and tape 3 sides (bottom and two sides) to create a large pocket to hold bills.
To create credit or business card pockets, make another sheet that’s 4 by 3.5 inches (100 mm by 90 mm).
Fold 1.5 inches (40 mm) over. To create two more pockets, repeat the step above and then tape the two pieces together, taping the second pocket a little lower on top of the first piece.
Tape the edges of the pockets and then tape the whole piece to the large pocket. To create another pocket, leave the inside part untaped.
Make a sheet of tape (as in the first step) larger than your ID card. Cut the sheet so that there is a 5 mm frame (big enough so you can see your picture and info, but small enough so the ID can’t fall through the opening). Now trim the outside so it is slightly larger in all directions than your ID. Tape three sides of this window to the inside of your wallet, or on top of the credit card holder. It’ll take a some trial and error to get it right, but it will be a great addition to the wallet. When you’re done, the ID should be able to slide into the untaped side of the holder, and once in, not fall through the open window.
Tape the completed pocket to the large pocket and again, you can create an extra pocket if you wish by leaving the inside part untaped.
Put your money, ID, and cards in your wallet and go show off your new creation!