Double-wide polypropylene panoramic sheet protectors allow you to customize presentations over a 17" wide spread. Sealed on three sides like top loading holders, but documents are inserted from the center. The fold-out feature allows the holder to be stored in standard, letter-size binders, while being able to display one 11" x 17" page (often called Tabloid, Ledger or ANSI B size) or two 8 1/2" x 11" size documents. Once the documents are in place, simply fold the sheet protector along the center to put it back in its original position. Acid-free material eliminates photocopy transfer. Pre-punched to fit standard three-ring binders help keep documents in their original state.