Also called pleated cardboard, corrugated cardboard is a material used to make custom boxes in Canada, among other things. It consists of three layers. The inner and outer two layers are flat, while the inner layer consists of fluting, an arched sheet of paper in a wavy pattern. Corrugated cardboard offers significant advantages as a packaging material. 1. Strength The pleated fluting of the corrugated isn’t just for looks. Its structure is designed specifically for durability and strength. The middle layer touches the outer and inner layers at alternating points, helping the cardboard hold its shape and making it more