FWIW - I've given up on the 72 hour idea and gone to 96 hours. I've also dropped many/most of the heavier tools in favor of more WATER.

Kits that are Ready at any time (this is in addtion to any in-house stockpiles)

Each vehicle has a kit (3x vehicles)
I have my "Non-Hypothetical" kit (discussed here earlier).
I have a small "Go" bag, not much to it, just a few basic items.
and then there's EDC, which is mostly flashlight, leatherman, lighter and bandanna.