If you dive, swim, work in the rain and need waterproof paper then you need a "DuraRite "Underwater Waterproof Notebook. "DuraRite" Paper this 4" X 6" Notebook is a "synthetic", paper created for use in extreme conditions. It is actually waterproof and can even beused under water. Now you can have a quality waterproof notebook that fits in your pocket! Our "DuraRite" Pocket Notebooks have 100 Universal Pattern pages (50 sheets).