Corrugated fiberboard mailboxes

Corrugated fiberboard is a paper-based material consisting of a fluted corrugated sheet and one or two flat linerboards. It is widely used in the manufacture of corrugated boxes and shipping containers. The corrugated medium and linerboard are made of containerboard, a paper-like material usually over 0.01 inches (0.25 mm) thick. Paperboard and corrugated fiberboard are sometimes called cardboard, although cardboard might be any heavy paper-pulp based board.