Space saving files pack a lot organization in a compact space. Attach directly to walls with hardware provided. Plastic. Expand with Add-On Pockets (sold separately). Space saving files pack a lot organization in a compact space. Attach directly to walls with hardware provided. Expand with Add-On Pockets (sold separately). Makes files easily accessible, unlike filing cabinets or shelves. Includes 3 separate pockets for maximum organization. Reduces desk clutter. Hanging File Systems Type: Hanging Expandable Multiple Pockets. For File Size: Letter. Utilize wall space for storage with this Universal UNV08121plastic three pocket recycled wall file.