The original mailbag escape was designed by Harry Houdini in the early 1900's.  His escape had him locked inside the bag and behind a square curtained box.  He would soon appear completely free.  Sometimes, audience members would be invited to stand around the curtain to insure no assistance. 

I have taken the escape to the next level.  There will be no curtain.  The bag will be tied, or chained shut, and I shall escape in plain site of the entire audience.  This is not easy, but I can do it!  Come and watch.