If you never want to be that guy - take the 2 day Wilderness First Aid course from NOLS or another provider. Knowledge and training and experience pack down fairly small in your bag. Repeat every 2 years while you have a son or daughter in Scouts. Encourage other Scout leaders to take WFA. And if you find a capable Scout aged 15 yrs or more interested in WFA, by god pay his way, you might be launching him into careers in medicine or an EMT. Surprise! You're a repeater, and someone the Scouts can really rely on when the chips are down. And you no longer think so much about squeezing down your FAK, WFA teaches you your FAK is the sum of what you carry (insulation, webbing, foam pads, etc etc)

My FAK fills a gallon zip lock. I say never think small when it comes to wilderness first aid, not when you are responsible for bringing Scouts back to the trailhead intact. You are better off searching for lists that contain what you know how to treat with, and adapting when you gain knowledge.