phase box

n. (also phased box) a simple, relatively inexpensive box designed to protect books, scrapbooks, albums, and similar items

Notes

phase box, or phased box, is typically a four-flap enclosure in which the boards are creased so that they can be wrapped around the book and are held together with string or hook-and-loop fasteners. Such enclosures were originally envisioned to provide temporary protection but are often used permanently to stabilize materials that will not receive conservation work.