Much like Wildcard my BOB is a holdover from the Y2K days and is designed to provide the bare necessities for 3 people for far longer than 3 days. It is also designed specifically to carry easy while on foot and moving fast. Now that's not to say that I wouldn't throw a bunch of extra stuff in the Jimmy (cause I would) if given the extra 5-10 minutes it would take to do it. But that would be all the "extra" stuff... not what I consider a necessity. If there is one thing I have learned from being present for two major disasters, it's that the roads clog up fast and sometimes very severely (I experienced one in a large city and another on an island with only two bridges to the mainland). That's why I plan for being on foot for part of the journey if need be.