Out of Thin Air!

Having caused a coin to vanish, you can just as easily make it reappear inside three boxes (bound together with rubber bands) which you take from your pocket.

Large match box.                       Smaller match box.                 Smallest match box.
Flat tin tube, small enough to go into smallest match box.
This is placed in next largest box, which in turn goes into biggest box. A rubber band is snapped once each way round each box.The banded boxes, with tube projection, are placed in the pocket. The vanished coin (which is palmed), is dropped down the flat funnel, which is then withdrawn and left in the pocket.  The rubber bands will close the boxes tightly when the tube is withdrawn..