I do not have the level of medical training as some on here but I have been through quite a few, and used to instruct TCCC courses in the Army (and have employed said aid in the field).
My more serious trauma bag at home has IV bags, lines, suture kits, scalpels etc. but my day to day and range first aid solutions are more tailored to getting the casualty to a higher level of care (ie flight medics, hospital, etc)
And like
@Chuckman said, if you don’t know how to use it, either get the training on it or don’t pack it!
My minimalist kit that I carry everywhere (into work, etc):
Israeli bandage
CAT TQ
QuikClot Gauze
I might add (or replace) my Israeli bandages with Olas (I think it’s something like that) Brand bandages that come with extra items that can be used to treat other wounds like a plastic piece that can be used as a chest seal as well as additional gauze for wound dressing
My more in-depth “IFAK” I have in my range bag (that goes everywhere with me), I listed the contents in another thread but reposting:
Quikclot combat gauze (I only have a couple rolls of this so I bring powdered quikclot which is not ideal in some situations but if I run out of the z-fold gauze and I can’t get the bleeding stopped or there are multiple casualties it might be needed)
Pouch of powdered quick clot
Israeli bandage
TQ
Curlex wrap
Gauze pad with Muslin wrap (old school dressing; can be used as a sling for broken arm or wound covering)
Narcan auto injector
Epi Pen
Nasopharyngeal airway
Chest seal
Tape
Scissors
Sharpie
Small boo boo kit with bandaids, small one time use alcohol pads, Neosporin etc