One other consideration is any personal emergency medical needs that you have. I picked this principle up from the military IFAK where each soldier carries a compression bandage, tourniquet, quikclot, etc. on the front of their uniform in case they are hit.

If you are diabetic, have angina, are allergic to bee stings, etc, those items that treat your unique health risks should be in your personal first aid kit. We're not talking chapstick and sunblock. Glucose tabs, nitro, epipens, rescue inhalers should be in your kit so that someone can help you.

You should also consider the sort of work you do and what active risks you take. If you sit in an office, that presents different medical issues than if you are an arborist or go on frequent hikes.