Couple things to add. Make sure your first aid kit has a pair of tweezers. Second, add a tube of Oragel to the kit. I have seen someones toothache ruin more weekend outings way too many times. For eye wash, you can buy a whole box of those sterile tear eye drops in individual tubes for cheap. I carry a cheap HF pencil magnet-the ones that telescope in my kit. Works great for raising those little unseeable metal splinters out of your hand and then you can grab with tweezers. Also handy for metal splinters in eyes. Some PeptoBismo tablets will help a sour stomach/diahrea and take up little space.
I also keep a pair of cheapo Walmart reading glasses in my kit-the ones that are 2x or more magniiers, and fold up in a tube about the size of a toothbrush. They are great for anyone to use as a magnifyer to see tiny splinters, ticks, etc.