Books 

Books of all kinds are valuable and we take them for granted now because of technology and society. Most people read their books digitally or listen to them as audio books, if that’s not you then you can always go to a library or bookstore to get a book. Having a library is invaluable the day after tomorrow, books can keep you occupied and keep your energy consumption down, they can also serve as trade items in the late stages of a world ending disaster.