Escape Change Illusion

Your assistant climbs into a cloth bag, which is tightly closed by a spectator. To do this, the spectator forms as many knots as he wants with a rope, so he can really tighten the bag. Now a large cloth is held up (not included). As you walk behind the cover on the left side, your assistant suddenly appears on the right side of the curtain. IMMEDIATELY the cloth is dropped. Your assistant has freed herself in a flash and you, as a magician, are now locked in the bag!

• It seems impossible to get out of the bag in such a short time and switch places with your assistant.
• The bag can be checked by a spectator beforehand. He won't find a double bottom or zippers or velcro fasteners.