Corrugated boxes are everywhere, carrying products from all over the world and just down the street. Your favorite pizza probably comes delivered in a brightly colored corrugated box. Your little brother or sister might use a big corrugated box for a playhouse. You might flatten and collect corrugated boxes for recycling.
Corrugated boxes are designed to be very strong. They are made of corrugated paperboard, which is different from the stiff paper[paper?:paper sample maker cutting machine] 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 corrugated box strong. Carefully designed inserts hold items in place so they won’t spill or become damaged.