There is no standard for archival storage enclosures. But see Archival Enclosures: Paper Records (pdf) by Rosaleen Hill for the Canadian Council of Archives which gives detailed specifications for archival enclosures. For specifications from an authoritative source also see the Storage and Handling leaflets of the Northeast Document Conservation Center, particularly the leaflet on Storage Enclosures for Books and Artifacts on Paper. For a topic not treated in the NEDCC leaflets, see Archival Enclosures: Optical Disc Media (pdf) from the Canadian Council of Archives.