Gaylord Archival High-Capacity Photo Preservation Box with Envelopes Safely store up to 1,700 photos 4 x 6" in size; two dividers split the box into quarters for organization Archival-quality, buffered B-flute corrugated board box is acid-free, lignin-free and pH 8.0-9.5 Passed P.A.T. (Photographic Activity Test), the international standard test for evaluating the quality of photo storage and display products Shallow lid is easy to remove for fast access, and metal edges add strength and a sleek look Includes 25 unbuffered envelopes (acid-free, lignin-free, pH of 8.08.5) designed for labeling and organization