IMO, a 72 hr kit is what you grab as you go out the door as a hazmat incident, industrial type explosions, etc start occurring next door.

In the case of a hurricane, which you get early warnings of: You leave with everything that you can pack into your vehicle(s). You will leave the majority of your emergency supplies at home as a "cache" to be utilized upon your return, providing there is a home left to reside in and/or there is an absence of utilities when I arrive back home.

Item to note: After the official FEMA statement, on their website, recommends everyone to keep 3 days of supplies at the top, the bottom section also states that 2 weeks of supplies on hand is advised, if the individual can do it....

That's a rough translation from memory.