Palomar Crumpled City Map is 100% waterproof and foldable. It provides details about a large part of the city, including streets, monuments, museums, art galleries and much more. It's convenient and compact. You just need to pull it out of its drawstring pouch, map out your route and stuff it back in your pocket. Other than being a map, you can even treat it as picnic cloth or umbrella.
Palomar Crumpled City Map weigh only 21g. A drawstring bag for carrying the map is also attached with.