I first know these cartographic products from the Facebook's page, Cool Hunting, and a local travel magazine. Therefore I went to a local shop to find but they were out of stock (well, I didn't think they are so popular as Hong Kong people seem not really interested in map collecting, I just think the shop had few stock only).
Information copied from Palomar's website:
Unlike traditional paper maps which can be awkward to deal with, the Crumpled City™ Map can be easily crammed into your pocket, backpack or the carrying pouch provided. without having to worry about refolding it along the original creases. Moreover, the maps are printed on special technological material that makes them the lightest and most resistant maps on market, as well as 100% waterproof.
The collection includes some of the most interesting cities on the globe. Each map provides details about a large part of the city, including streets, monuments, museums, art galleries and much more.
Crumpled City maps include a sightseeing index and a list of unique "Soulsights".
23 cities: Amsterdam, Barcelona, Berlin, Chicago, Copenhagen, Edinburgh, Florence, Hamburg, Helsinki, Lisbon, London, Milan, New York, New Zealand (Auckland, Wellington, Queenstown), Oslo, Paris, Rome, San Francisco, Stockholm, Sydney, Tokyo, Toronto, Venice
It just takes 2 seconds to open and close this innovative soft map
The map includes all the most important informations about the city as well as a list of ten "Soulsights"
Weighing only 21 grams, it is super resistant and 100% waterproof
Carrying pouch provided