Something I have not seen suggested yet is to carry maps in your BOB. You may know where you plan to go, but alternative routes may be necessary due to blockages, etc. A good set of topo maps should be included, also, for any situations that might require you to walk or scout around.
Very good idea. Would also be good to have a compass as well. And knowing how to use it would be a good idea as well.
I like the idea of having an extra pistol set aside in the B-O-B, but the only extra pistol I have is a single action .357 revolver. On the plus side it is reliable and accurate, but quick shooting wouldn't happen.
I could put a .22lr in there, but I use that often for target shooting.