CORDURA Fabric: Weather resistant and incrediably tough fabric with ruggeg zipper closure.STORAGE: Four internal writing instruments pockets, one pen refill pocket, and more.INTERNAL POCKETS: Perfect for storing other field equipment and other important take along information.DESIGNED: Specifically designed for 4" x 6" Rite in the Rain Top Bound Notebooks.ORGANIZATION: Rely on Rite in the Covers to keep your notes safe and sound through thick and thin.