Not a one-way mailer
Archive boxes are one-piece A4 cartons with handles and an integral lid, for files, folders and lever arch files. They arrive flat. Made up, the sides are triple thickness, which is why they are described for stacking.
A Packaging Wholesale account that posts goods should not substitute these for a postal carton. They are built to be lifted again.
Ordering
Choose the archive size and add it to the usual basket. The 3pm dispatch and the £50 ex VAT delivery line are the same as for tape.