Gaylord Archival 3 mil Polyester Envelopes (10-Pack) Protect fragile materials such as broadsides, comic books, small maps, prints, photos, family records and documents Your family history deserves the same level of protection used by the world's leading cultural institutions Durable, flexible, chemically inert archival polyester won't damage, discolor or adhere to contents Edge seal on three sides with the opening on the short side Use with archival-quality file folders or print boxes from Gaylord Archival (sold separately)