24 x 36" Blue-Gray Archival Storage Box for Standard Posters
Amazon.com: AVIDITI Long Cardboard Boxes, 25"L x 3"W x 3"H, Pack of 25 | Poster Tube for Mailing and Storage of Blueprints, Artwork, Crafts, Long Art Holder, 25 inches : Office Products
Amazon.com : Vertical Flat Folder (Set of 8) Size: 27.5" H x 39" W x 0.5" D : Manila File Folders : Office Products
Bigso Art Storage Box | The Container Store
Deluxe (27 x 41") Movie Poster & Print Storage Portfolio - Baroque Portfolios