This is not a magician fooler, the method should be obvious to most magicians but will fly right
past laymen.
That said it is a good use of the prop and a nice routine. The variations
taught are good, especially the "totally impromptu" version with sugar packets, using the bag
initially to carry your sandwich.
If you don't have one of these props (or you don't know
how it is done) this is a cheap way to pick up a very natural looking prop that has a multitude of
uses.