Crystal Clear Hanging Bags are the same style and quality as traditional Crystal BagsXL®, except they are built with a reinforced hang strip on the top for easy retail display. The bag opening is also moved to the bottom of the bag with the adhesive strip on the bag flap. It is as easy as inserting an item, peeling the adhesive strip, and then folding and pressing the flap closed. Made from Biaxially Oriented Polypropylene (BOPP), a superior material that does not easily rip, tear, wrinkle, or fog like other plastics. Bag sizes indicate the opening side as the first dimension. 2mm size tolerance. 40 Micron wall thickness. Archive safe. See recommend size chart for popular sizes."