Hmmm, dunno about that. A BOB is one set of gear with a purpose in mind -- get to a bug-out location, it may contain no food. A 72 hour kit is designed to survive for 3 days -- doesn't take much to do that, doesn't even require a backpack, but necessarily contains three days of food and water for however many people the kit is designed to support. A SAR kit is another animal altogether.

That said, going through the steps building a SAR kit would better educate the user on what is needed and what is not required in a BOB (the classic BOB based on a backpack, not a truck). Using the SAR kit would also give a person experience in what he needs to have and why. Education and experience combines to knowledge. The most important of all is to know what else you need to learn.