Crumpled City Maps are the best light, compact, strong, waterproof travel maps. They can just be crumpled between uses and don't need meticulous folding like standard maps. Nor do they flatten the battery like a Smartphone app. And they make an excellent showercap, rain hat, picnic mat/tablecloth and hold-all (when tied up).
These are the work of award winning young Italian designer Emanuele Pizzolorusso. He uses a non-tearable material called Tyvek which is used in the building industry for waterproofing and dustproofing. Tyvek is already in use in our near-famous Mighty Wallets http://www.thegoodstore.com.au/l153-0/looking-good/dynomighty-mighty-wallets/
Crumpled City Maps also have a historical precedent - Escape Maps. In WWII, Waddington (the Monopoly Board Game people) used to print maps on silk to allow Allied soldiers to escape to freedom. Your overseas adventures may not be quite as life and death, but Mr Pizzolorusso's maps can still save you from a lot of bother.
Maps for select international capitals currently available - with more to come. Each comes in its own little drawstring pouch, and is neatly gift boxed. Unfolded dimensions : 87cm x 58cm ; Weight = 21gm