I'd suggest one of our top priorities in our BOB's should be MAPS..
A few years ago my friend and his wife invited me to visit them in their home city,so I threw a few things in my small rucksack and jumped on the coach, but forgot a map of his city.
When I arrived we went strolling out and approximately on foot but because I had no map I felt totally disoriented in the peculiar streets, or I didn't even know which way was north and it was a very unsettling experience.
Source: thesurvivalpodcast.com