My laptop bag trauma kit includes:
- CAT tourniquet
- OLAES compression bandage
- Combat Gauze
- Nasopharyngeal airway
- Chest seal x2
- Gloves
- CPR mask
- Duct tape
- Mini-Sharpie
I am trained on the use of all of these, plus a decompression needle. The needle isn't in my laptop bag kit because I fly a lot, but I keep full kits that include these in my car, range bag, on my person when at the range, and so on.
Over the years I've taken classes from a number of instructors on how to deal with range-related injuries, and I continue to seek out instruction on this.