The Ortlieb map case is a tough piece of kit designed to stand up to the weather. The Ortlieb map case is made from a very tough but flexible and surpriseingly soft feel plastic. This plastic will not degrade or yellow in sunlight. The top of the case folds over several times and then velcros in place to form a very effective seal against the elements. The Ortlieb Map Case is designed to take an Ordnance Survey map double folded which should be enough to see a large part if not all of your route. It has four attachement points and comes with a lanyard giving plenty of attachment options to you or a piece of kit.
The Ortlieb Map case is gauranteed for 5 years.