6 x 6" - 1.5 Mil Flat Polypropylene Bags. These lay flat, open top crystal clear plastic bags are best used for lightweight products and protects from dirt, dust and moisture, grease and vapor resistant. The high clarity of these polypropylene bags enhances the appearance of products. Clear flat bags meet FDA and USDA specifications for contact with food products. Polypropylene bags help keep packaged foods fresh. Close bags with bag tape, twist ties or by heat sealing. Select from many different polypropylene bags to fit your packaging, shipping, displaying and storage needs.