Great Big Fat Sidewalk Shuffle by Martin Lewis Morgan and the bag can be

and the bag can be 100% examined

A double back card

It has no competition

The effect is very simple

I can say from firsthand experience that this is one of those moments and the release of this will mark a huge leap forward in prop-less Mentalism and for the art form itself

Great Big Fat Sidewalk Shuffle by Martin Lewis Morgan and the bag can beMartin's classic effect, still used by magicians everywhere, after 30 years. This is in three phases. The first two are similar, but with variations in handling. The third phase has an unexpected "knock out" finale. In the first two phases three blank cards and an ace are shown. A blank is placed aside facedown, and the ace is put between the other two blanks. A spectator fails to find the ace because the three cards are shown one by one to be blank,