Dimensions are 20 x 26 x 1 1/2"Horizontal or vertical storage for large documents. Features an extra-large drop-front for easy filing. Button and string closure.Store documents in file folders or Melinex sleeves, available and sold separately, and insert into box (keyword: file folders, sleeves).Specifications:Acid-free Lignin-free pH 8.0 - 9.5 B-flute corrugated (exceeds 200 lb. test) Blue 3% Calcium carbonate bufferSize: 20 x 26 x 1 1/2"Note: It's recommended that blueprints, cyanotypes (old blue photos), albumen prints (a photograph printed on paper that is coated with an emulsion of egg whites) and early color photographs be protected and stored in unbuffered material.
