An extremely well-written Katrina memoir includes a list of great suggestions to keep handy for bugging out. Most of those could be scanned and stored on an encrypted USB (or two).
LISTENING TO KATRINA - HYST - Documents
HYST = Have Your S*** Together
Take a peek at his entire memoir too. It's amazing he's able to write this so humorously about such a dire situation as Hurricane Katrina. But he pulls it off. Two pages prior to this page, he wrote about large populations trying to evacuate all at once. Been there, done that! Yes, I was in the Rita evacuation, and completely agree with him that bugging out/evacuating is dreadful -- we saw so many serious car accidents, so I really shouldn't complain, but it wasn't something I'd repeat unless my life were actually in danger, instead of possibly. More people died in the evacuation than died where Rita actually landed.
PS: We don't have a laptop, but hubby removed our hard-drive to bring with us during our Rita evac. Yes, we realized we couldn't just put it into any computer and have it run, but we would be able to access our saved files.