Funerary texts, such as the Book of the Dead, were often written on what Egyptian equivalent of paper?

Egyptian funerary texts, such as The Book of the Dead, were expensive items, often commissioned by people for their own funeral. Initially reserved to the royal family only, the tradition later extends to several members of the social elite of those times. The texts were written on papyrus, a thick material created from the pith of the papyrus plant. Similar to the paper that is used today, the papyrus is considered representative of the Ancient Egypt and the Egyptians referred to it as wadj.