I'm going to show you how you too can make a magic wallet. Some sewing skill is helpful, but not required. You can make this by gluing two sets of two firm sections with the ribbons between them or sew a leather or vinyl covering. The latter is the technique I used.
Step 1: Gather Supplies
Cardboard Any box should do...
Vinyl or leather An old purse works nicely for this...
Strapping This should be rugged. I used the strap from an old 35mm camera. An old Lanyard my do too.
Glue You may need this. I didn't
Sewing Thread and needle Not pictured, but it's what I used...
Step 2: Prepare Materials
Cut two pieces of vinyl or leather to about 3 1/8" x 9 1/8" You might want to give a little more leeway than the 1/16" I did. It's up to you.
Cut 4 pieces of the strapping to about 4" each.
Step 3: Build Side One.
When that side is done, insert the carboard tightly and sew the short end as tight as you can. Remove the cardboard.
Now turn the cover inside-out (actually right-side-out) and inert the cardboard piece again.
Step 4: Build Side Two.
Step 5: Finish Side One.
Step 6: Finish Side Two.
The complete wallet will look somewhat like the second picture below and, when closed, the third picture.
Step 7: Demonstrate and Awe Your Wife And/or Kids!
Now tuck your business cards into the other side. Close it and open the other way. Magically your money and cards have switched places!
Disclaimer:I take no responsibility for pricked fingers, four letter words that may be expressed, and sudden discovery of sewing skills one might experience while constructing this instructable