In addition to storage of glass plates, many types of flat objects of cultural value such as photgraphs, graphics, prints, drawings, documents etc. are stored in opaque, four flap paper folders.
Four flap folders
Seamless, four flap folder enclosures folded from a single sheet of either buffered, natural white coloured museum paper or in unbuffered, opaque photographic archival paper. These folder enclosures are suitable for archiving glass plates, valuable photographs and negatives.» to the product