Lineco Museum Storage Box blue-gray-holds size 20 x 24 x 3 inch Museum quality art/photo/document/other archival storage box in blue/gray Made out of buffered 60 point board Protects against acid - light and dirt Features convenient drop front opening for easy access to contents Holds 20 by 24 by 3 inch art, photography, or documents-actual size is 20.5'' x 24.5'' x 3''