Ok here goes with an inventory of my IFAK and a few comments.
The two items that is not in my primary IFAK is a C.A.T. TQ and trauma shears. I carry my TQ on my first line gear in a custom made carrier on my kit so I can access it w/o opening my blow out kit. IFAK's tend to have "aid bag diarrhea" at the worst possible time. The only medical intervention you do while under fire is apply a TQ and digging in an aid bag is not a good idea at this time, you should be shooting bad guys or putting on a TQ, while you buddy is shooting bag guys for you. Now I do have a IFKA that goes in my car as a "just in case trauma bag" and yes it has a TQ inside of it, actually 2 of them. I'm talking about my IFAK that goes on my first line gear and by armor vest.
1 x 6" Pressure Dressing
1 x Quick Clot Combat Gauze
2 x Compressed Kirlex gauze (you would be supprised how much gauze you can pack in a big, deep hole, like the kind you get from rifle shots)
1 x Hemcon 4x4
1 x Quick Clot 50g size
2 x Nasal Aiways
1 x 14g x 3.25" Angiocath (for needle decompression)
1 x small roll of duct tape
1 x Petrolaum gauze - you can also use a quick clot package or a pressure dressing package if desired
1 x 2pk Acetaminophen tabs - (other OTC pain meds can cause nausa on an empty stomach
1 x 1pk Levoquine 500mg tab. (antibiotic)
1 x Sharpie, black - for writing TQ application times or vitals
1 x Red Chem light - not a bad idea, you can drop one on someone who is down or use them as a triage device at night (red for critical, yellow for delayed, anyone else better be up and moving)
1 x C.A.T. Tourniquet - in holder on my kit
1 x trama shears - outside my IFAK for quick access, usually behind my mag pouch up front.
This seems like a lot of items to some but it fits inside a North American Rescue Maritime IFAK. This bag is 30% smaller than their "standard" bag.
A few other random thoughts you should keep in mind. Make sure if you mount you IFAK on your body you are able to reach it with either hand. IFAK's do not ever get mounted on you back, I still see people doing this. Get a real TQ, actually two of them. 1 goes in your IFAK, 1 is to practice with. Do not use your practice TQ in your aid bag or you risk failure when your life depends on it. Also when I say "real tourniquet" I mean a C.A.T. or a SOF-T. These are both combat proven. There are several others out on the market, some can work when used correctly, many do not. Use what is proven.