Rubber gloves first and foremost. Tourniquet, quick clots, triangular bandage, Israeli battle dressing, are a few must haves. Ability to achieve hemostasis in the looming threat of hypovolemic exsanguination (bleeding to death) is a worst case scenario but something you can easily and practically do something about.
Know how to use your torniquet and quick clot and have them near the top of your bag, not buried at the bottom.