Finally a way to do pseudo-psychometry that makes sense. I always thought that individual envelopes were suspicious as were individual bags. Too easy to somehow identify each one uniquely.
One bag where everyone puts their personal item and the items get mixed - that makes sense. And the S.O.S Bag (why S.O.S?) is a quality low key bag.
And, although the instructions don't say it, this is demonstrated on Mind Mysteries Too Vol. 4.