These 6"x7 5/8" flat storage Bags are an acid free, archival quality product made of crystal clear polypropylene.These bags have a "fold over" strip on the top of the bag so the collector can fold the top flap over, tape, and lock in the item. - Resealable for your Book needs & More! - 2 inch flap for closure - Crystal clear - Flat - Protect Books,photos,ephemera,more while handling -Great also for magazines,prints,art work,ephemera ,photos,More! - Small Size holds average thickness books nicely up to 5"x7" - Size - 6" x 7 5/8" (100) ct