I've never yet needed to bug out, and haven't gotten overrun by zombies yet, either.

But I do use pieces out of my SHTF bag on an almost daily basis. Saturday I used a small roll of gauze, 2 bandaids, 2 aspirin, a large safety pin, and 3 carabiners. Another weekend I used 2 Immodium, 2 aspirin, 3' or duct tape, 1 7" ziptie, and the sewing kit.

One thing I'm quickly realizing is that my "ultralight" FAK is too small. I'm thinking of replacing it with one like the one I have in my room (the Johnson & Johnson "All-Purpose First Aid Kit" with 170 items in it), adding even more to it after some research, and packing it in a Pelican case.