I have a "different" type of BOB carrying aperatus. I use a fishing vest. It has tons of pockets to put everything in. It distributes the weight on the shoulders well.
Also, if I can use my vehicle I have another 72 hours kit in a "rubbermaid" container. It does have a sturdy tarp that the fishing vest doesn't. However the vest does have a sturdy poncho which I can use as shelter.

Basically it does come down to what kind disaster is going to happen. Hurricane-I drive my truck away with more luxuries. Riot-grab my vest and head for the woods.
Just my two cents...YMMV

Charles