Duct tape of course!
Any bill to measure the size (1, 2, 5,10, 20, ect)
Scissors or razor blade
Mat to cut on (optional)
Step 2: Making
Make two sheets of duct tape that are the same size and measure with your bill.
Step 3: Assembling
Place the two sheets you just make from step 2 and put them next to each other and tape them together.
Step 4: Assembling 2
Fold the sheet in half and cut two pieces of duct tape to close the sides of the sheet.
Step 5: Folding
Fold the wallet in half and if you want to put it under a bunch of books or something heavy and flat.
Step 6: Accessories
This is how you make pockets. Take a small piece of duct tape and put a bigger piece on top of the smaller one. Then place it on the wallet and put a piece of duct tape on the bottom so your money doesn't fall out.