Gaylord Archival 80 lb. Text Unbuffered Long Side Opening Envelopes (50-Pack) Preserve small documents, thin pamphlets and loose papers for future generations Archival quality: acid-free, lignin-free, passed P.A.T. (Photographic Activity Test) Your family history deserves the same level of protection used by the world's leading cultural institutions Generous 2 1/4" nonadhesive flaps protect against dust and debris Use with archival-quality document or print boxes from Gaylord Archival (sold separately)