Speaking from personal experience, fanny packs are over rated for inner ring equipment.
My personal preferance is based on the USMC survival kit. Everything is in a couple of pouches (or three if you include the FAK). They sit in the very top of the B.O.B. When TSHTF you grab the bag and boogie. At the first possible moment, you stop, open bag, grab the pouches and drop them into your pockets.