This is the way I fold my bags, to pass out to origami students to hold their completed folds. I have them un-fold and then re-fold the bags prior to actually using. Generally there is one or two who comment that it is like the folding of the American flag - which it is. http://www.instructables.com/id/HOW-TO-ORGANIZE-YOUR-PLASTIC-BAGS/
Kathy Knapp, Peoria, Illinois, USA Do well your part today. - Juliette Gordon Low
