I tried to make these work . . . I was unsuccessful. This concept has been explored, described, and made by many creators over the years. This is one of the less impressive ones.

It does look good. However, I do not see how you could hand this to a participant, have them open it and feel confident that the secret would be secure. It did not work for me. I tested it a number of times . . . it never worked out.

I then had a mentalist friend over and had him try as well. He was not impressed. The instructions are 12 pages that cover a few routines but very little in the handling of the envelopes. (the most important part of the effect!)

If these work as well as James Biss says they do in the instructions and advertisements then he needs to make a DVD or secret youtube video to explain (in detail) his handling of these somewhat awkward change bags.