I've heard this put various ways and don't know who to credit... There are three types of trauma patients within this context:
Those that will live no matter what you do.
Those that will die no matter what you do.
Those that will live or die based on you doing the right thing at the right time.
My list: I keep a TQ on my person, an IFAK in my murse or pouch on my gear, and larger aid bags in the cars. I have used the IFAKs and aid bags on multiple occasions over the years.