Why is a pencil case called a pencilcase?

A pencil case is called a pencil case because it serves as a container specifically designed to hold pencils and other writing instruments. The term combines "pencil," referring to the writing tool, and "case," indicating a protective or organizational container. This name reflects the primary function of the item, which is to keep pencils organized and easily accessible. Over time, pencil cases have also come to hold other stationery items, but the original name remains.