Step 1: Step 1: Make the Sides
First, get your duck tape. Pull out the tape and measure a piece 8 inches. Then, repeat this process 3 more times. Then comes the tricky part. Take the back side of the tape, and stick it to the sticky side, just enough to keep the two pieces together. Do this until all four pieces are taped together. The first picture is me measuring a piece of tape, the second is what one sides looks like after sticking the pieces all together.
Step 2: Step 2: Attach the Other Side
You don't want your wallet to be sticky, so repeat step one, except make each piece just a little bigger than eight inches (8.125-8.25). Once this is done, you should be able to stick these two large squares of duct tape together.
Step 3: Step 3: Fold Wallet and Add Trim
Now, fold your wallet in half the long way. Crease hard. Now, measure how high your wallet is. Take and measure out a piece of duct tape as long as your wallet is high. This is the trim. Attach the piece to one side of your wallet, and fold it over to tape shut one side of the wallet. Repeat for other side.
Left image is trim when stuck to one side, right image is after trim has been folded over and stuck to both sides.
Step 4: Step 4: Finishing Touches
Once your wallet is sealed, you are basically done! Fold your wallet in half for a bi-fold, or twice along the third lines to make a tri-fold. Enjoy your easy but high quality wallet!