Boxes are made at special factories called Box Plants. Corrugated boxes are designed to be very strong. They are made of corrugated paperboard, which is different from the stiff paper known as “cardboard.” Look at the edge of corrugated paperboard, and you will see a row of air columns. the air acts as a cushion, while the paper columns make the material strong. Each box is made to hold something just right, protect it from banging around, and keep it from spilling. Boxes are made with important information printed on them about what’s inside, or how to lift or move them. Carefully designed inserts hold items in place so they won’t spill or become damage.