Speaking of FAKs - . . .I have a tendency to want at least SOME trauma "stuff" in the kit. Frankly, I'm NOT qualified to do c-collars, airways, BP and the like, so the high end EMT kits have stuff I DON'T need, but to get the stuff I WANT, I either have to add to an existing kit, or remove from a bigger kit. . .
Just remember: ABC - airway, breathing and circulation. . .
Both of my big kits (home and truck) have stuff in them I'm not qualified to use, but I have them anyway with the understanding that someone else on scene before the EMT's may be qualified but ill-equipped. It's the old trade-off of have it but not need it, or need it and not have it. I tend toward the former. The small kits I EDC (backpack & flight bag) are for small cuts and splinters -- NBD.
When a Navy command I was with started replacing stuff I snagged one of their hard cased FAK's and when I opened it all I found were large gauze and wraps for major injuries -- no band-aids at all. Small cuts you can fix with a band-aid aren't life threatening and are considered NBD; this kit was for bigger injuries.