The Nile offered something invaluable to Egypt: papyrus.
Papyrus is a species of reed (plant) that grows on the banks of the Nile River.
From papyrus, the Egyptians created paper and soon exported sheets of paper throughout the ancient world.
This paper replaced the clay tablets of Mesopotamia, which were incredibly difficult to transport.
Papyrus was light, it could be rolled, and was easy to handle.
Papyrus paper was used until the 12th century AD.
You can consult the following source to learn more about the subject:
Casson, L. et al. (2001). Egipto antiguo. Castaño, A. (trad). Las grandes épocas de la humanidad. Historia de las culturas mundiales. México, DF, México : Ediciones Culturales Internacionales, S.A. de C.V.
English translation: Fernanda Leyva