Step 1: Begin Taping the Inside Cards Together
Lay three cards face up about 1/4 inch apart. Cut a strip of tape to hold them together.
Flip the three over using caution and tape the same spot on this side as well -- the doubling of tape will not only make the seam stronger, but also prevent your money from sticking to the pocket.
Step 2: Cut Pockets
Once they are cut, lay them face down onto the face up side of the cards from step 2.