An easy way to keep your maps in the best condition It keeps your map from damaging to allow clear guidance with the path It is available in various sizes to be fit for items like maps, books, charts, etc A waterproof case for all types of maps, books, etc The case comes with a Hydrolock zip seal to safeguard all the items inside NRS HydroLock Kayak Map Case - No more soggy charts or maps flapping in the wind, with the NRS HydroLock Mapcessory Map Case you can navigate with ease. Just fold your map to the right section, seal it inside, secure it to your boat, and go! A clear urethane window lets you see both sides of your map, chart or guide.