Our Archival Newspaper Kits are the ultimate acid-free protection for collectible newspapers. They are available in five sizes. The kits consist of 4 mil polyester (mylar) sleeves, conservation-grade super acid-free backings and black AlphaCell conservation-grade storage boxes. The materials used in these sleeves, backing boards, and storage boxes are the only materials approved by the Library of Congress for INDEFINITE STORAGE, preservation, and care of paper products. You can also purchase all kit items separately. Each kit holds 8-12 newspapers in sleeves and backings, depending on the height of the box. Purchasing the items as a kit can save up to $25.00