Needs: quality tourniquet (two is better) make sure you know how to use it and practice, adhesive chest seal-think maybe a razor and some wet wipes too, quality trauma shears (wont bend, has serrations on at least one blade), quickclot is a maybe (have actually used twice very selectively), Israeli bandage, gauze sponges and wraps, Coban, CPR mask with barrier filter. Also there was a fad a couple years ago about Narcan, but it is only useful in a very few situations, eye wash, burn ointment, benzocaine, or other topical anesthetic like oragel works on abrasions.
I don't carry a lot of dressing stuff, rather rely in the trauma shears. If you are in a penetrating trauma setting, you'll cut clothing, and that can be used to pack wounds (atop sterile gauze) while you wait for EMS, or transport. Think about your actual needs and adjust your kit accordingly.