Holy crap kid, yeah, you should fit everything in there. Please tell me this is a "base camp" type of FAK, not a "hey, let's go up to Mammoth for a week long Hi Adventure trek" kit? Otherwise, you're going to be using half the stuff on yourself. Not to mention, this bag will NOT be easy to carry if you've got on a backpack as well.

And if it IS a backcountry kit, may I strongly suggest a modular approach, where each Scout gets a packet of stuff from the kit? This is based on carrying lots of bags as an EMT, and about 8 years in Scouting myself.