Our Tall Corrugated Boxes open and load on their ends saving time and money on sealing! Our Tall Corrugated Boxes may be used in place of mailing tubes. Tall Corrugated Boxes are manufactured from 200#/ECT-32 kraft corrugated unless otherwise noted. Sold and shipped flat in bundle quantities. The sizes listed are all inside dimensions. Sold in bundle quantities to save on storage and shipping.