Organising a FAK seems to be a very personolised process (which is one of the reasons that EMT's have their own, personal jump bags). So all i can do is tell you how I pack mine.

My main kit is the smaller grabber bag


I have divided my 5 compartments into:
1 - Blood (guaze, trauma pads, field dressings, cotton wool)
2 - Sundry (kidney dish, scissors, forcepts, needles, space blankets)
3 - Medication
4 - bandages and dressings (band-aids, various bandages, sterile dressings, burn sheilds, semi-rigid cervical collar)
5 - sport-pouch (lots of adhesive tape, scissors)

The compartments are attached to the inside of the main bag with velcro.

I also have 2 smaller kits. they are small enough so that a specific packaging system isn't essential.

BTW, first time a put a picture in a post - i am quite proud <img src="images/graemlins/crazy.gif" alt="" />