I think planning for the worst is a key consideration. That means major (possibly arterial) bleeds, major breaks, anaphylactic shock, and concussion. I am willing to bet most of us carry first aid kit for minor cuts, sprains and bad heads. Trust me, when you need to stop a major bleed you will be glad of a tourniquet and multiple thick dressings (I have severed my radial artery, so know the story on that score).
Importantly, also consider that wherever you go you may not be able to get back to the hut, tent or fly. I take my Outdoor Research helium bivvy, a stove, some food and a puffer jacket on every hunt for that reason. Major injury, lost in the dark, river too high, bluffed out - sometimes better to stay out until you can find your way or help arrives.
In short, carry first aid kit for the worst eventuality and be prepared to stay out for 24 hrs with what you are carrying.
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