11 1/4" x 8 3/4" x 4" Corrugated Boxes. These cartons were designed to fit the most popular paper sizes. Prevent damage to forms, catalogs, letterhead and other printed material by using the right size carton. Manufactured from 200#/ECT-32 kraft corrugated. Cartons are sold in bundle quantities and ship flat to save on storage space and shipping. 25/Bundle.