As important as what you have in your pack is where you plan to go. Overseas a bug out bag is critical for getting you from your residence to a location from which you can be evacuated. The problem with a bug out bag in the US is that just when you need it, it is likely that the roads will be jammed with cars trying to bug out. Still, having stuff in your car to survive on beats the alternative.
Which is why I occasionally extend my daily 6 mile walk to 15. I'm not going to avoid a nuke on my charming city but I can put some distance between me and the zombies.