16 Paper; document files; file folders; paper file jackets; file pockets for stationery use; paper expanding files; stationery-type portfolios; flip chart cases; flip chart carrying cases; pencil cases; pen cases; binders; loose leaf binders; holders for documents, artwork, prints, photographs and the like; display sleeves for holding and protecting documents, artwork, prints, drawings, paintings, sketches, press cuttings, posters, charts and the like