I have 2 books in my big bag, one's practical, an old Scout Field Book. It's a good read, plus lots of great info that would be handy out there. I feel like I've read it cover to cover multiple times, and yet I always learn something. The second one, well, it's a very small Bible. I figure if TSHTF, there's going to be some comfort there. (Or at least some dry fire starting material?)