Everything goes back in the same box, in roughly the order it came out. The foam is cut to shape, so if a piece does not sit flat it is in the wrong slot.
Separate the three shell pieces — they pull apart the same way they went together.
Take the backdrop off the crossbar and collapse the stand. Fold the backdrop loosely rather than tightly; creases are easier for us to steam out than crush marks.
Seal it with the tape provided and you are done.
Two minutes, and you'll know either way.