I don't plan to bug in but I do plan to avoid the mad rush of cattle fleeing the cities when all heck brakes loose. Stay off main highways n roads and have several routes to your b.o.l.
We don't love in the city for many reasons, and not leaving is one of the reasons. But we do have BOB's. Why, well for any reason we may need to get buy for a few days. We can carry the bags when traveling for business or pleasure...even day trips. Definitely take the BOB when when traveling during snowy weather.
I don't worry too much about a localized emergency as I have places I could go short term.
I worry more about a large scale situation where I may be gone for months.