There are several out there commercially available. Basically, they all have two or more pockets. Some even have a section (possibly zippable) where you can stick your hand right through the bag top to bottom. Others have a button/switch, a twisting handle knob, or just a tab which you use to move from one pocket to another. Basically, you toss stuff into one pocket to make it disappear and you can have the other pocket preloaded with other stuff to pull out... thus "changing" things from one to another. But how you choose to routine it and practically go about using it is entirely up to your imagination. And that's where the entertainment value comes.
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