Have several kits of different sizes for the truck or backpack or camp, but the one thing used the most is 1 inch waterproof bandaids. They cover 99.9% of finger,hand and toe cuts and a lot easier to put on than trying to make one from duct tape and leaving blood smeared all over truck and camp. Usually with friends and family I go through a box of 30 a season and just stock up every spring when going through my gear.

Check with the American Red Cross for lists of supplies to make a first aid kit and a trauma kit. Then put it them together yourself.
I needed a trauma kit on the 4th and it was a life saver.
Prarrie Dog

Everyone else must have a better stomach than mine, but I'm never without some Tums or Rolaids. Somethin' about that camp food....

Thanks for all the great suggestions, I've been thinking about how to piece a first aid kit together.

Moleskin and Benadryl.  Last year my elk camp roommates used up the moleskin (blisters) and a doctor in camp was severely allergic to some local weed and really needed the Benadryl.

Don't forget the imodium and some Pepto tablets.  A bad stomach will end any trip in a hurry and vomiting / diarrhea leads to dehydration.

And some Ivy Dry or similar.