A cardboard box is most commonly called a carton or a case, especially when it's a corrugated fiberboard shipping container. The term 'carton' can also refer to boxes made from paperboard or liquid packaging board, though 'cardboard box' is often used colloquially for both types. A cardboard carton is made of thick paper stock or heavy paper-pulp. This material is used to make a variety of products such as small containers, product packaging, and even structural support for less rigid items like notepads, inserts that keep clothing items like button-up shirts from losing shape, and more.