I'm similar to
@mdwest.
I have an ouchie kit to cover things high probability / low impact annoyances and I have a trauma kit for low probability / high impact accidents.
What goes into each depends on the situation. I like moving light and so I don't want to carry more than necessary. That said, I base my kit on the likely concerns, along with the amount of time it would take to get help. If I'm on a trip in the deep back country and it would take a while to get medevaced, I'm going to have a more substantial kit.
On the ouchie side, I usually have the following:
-multiple sizes of bandaids
-neosporin
-medical tape
-bit of gauze
-tweezers / magnifying glass
-Aspirin
-anti-histamine
-anti-diarrheal
- Nuun or Liquid IV (for electrolytes)
-Hydrocortizone cream
-Antiseptic wipes
-Moleskin (Nothing ruins a good walk like blisters)
-Needle (For lancing blisters)
On the trauma side:
-CAT tourniquet
-Israeli bandage
-Quick Clot
-NAR compressed gauze
This is all the basic stuff. It packs up tight and doesn't require much space.
For a longer trip, I'm likely to throw in a Sam Splint, shears, extra gauze and tape, plus some extra medicines. Depending on the locale, I'm not against bringing just-in-case antibiotics or antimalarial.
Plus, most of it can be found at Walgreens. The rest can be bought on Amazon or through North American Rescue.