First, Get any duck tape color of your decision.
Second. Cut 4 pieces of duct tape as long as you want and tall as you want. I suggest you make it a little longer and taller then a dollar bill. Measure to make it good size
Tape 2 of the pieces together stickty sides are stuck to eachother so you can see the color of your decision on front and back
Tape your other 2 pieces of duct tape the same as before. the tape both of them together on the bottom and on the left and right side and then draw on the wallet if you want with sharpie markers.