Clear Flat “Cello” Polypropylene Bags, 3x5 inch, 1.2 mil. Clear “cello” bags made of 100% virgin, high clarity polypropylene film. Polypropylene is a material that has FDA and USDA approval for food packaging. These bags are made of sturdy clear 1.2 mil polypropylene bags for photos or any item where visual appeal is important. Clear "cello" bags made of 100% virgin, high clarity polypropylene film. Polypropylene is a material that has FDA and USDA approval for food packaging. Our bags meet FDA and USDA specifications for food contact and are made of 100% virgin, high clarity polypropylene film.