Crystal Clear plastic bags are an acid and lignin free archival safe way to protect greeting cards, postcards, prints, artwork, photos, documents and more! Made from high quality material that contains 10% recycled content, these 1.6mm thick bags will not easily rip, tear, wrinkle or fog. See your work, not the bag as these bags provide Crystal Clear optical clarity. Each pack containts 25 bags. Each bag features a protective closure flap that has a re-sealable adhesive strip on the outside of the bag instead of the flap, which prevents glue from coming in contact with your product.