Has anyone considered an eReader (Kindle, Nook etc.) as part of their survival kit? It would be a very light and compact way to carry all of your survival books, maps, first aid guides etc. all in one place. Since you can store PDF's on them, you could even store documents that you've created yourself, such as escape routes, checklist etc. Of course, any book that you'd like to include would have to be available in an ebook file format. The battery lasts for months on a single charge, so that shouldn't really be an issue.