Corrugated cardboard is easy to recognize.
Many types of corrugated are available, each with different flute sizes and thicknesses. The corrugated cardboard most commonly used to make boxes has one layer of fluting between two smooth sheets. Corrugated is made primarily from lumber industry byproducts, such as sawdust and wood chips. Nowadays, one of the most frequently used raw materials for making corrugated is old corrugated. Corrugated is an inexpensive packaging material compared to most.