Remember it is a First Aid Kit. You don't need a bunch of band aids and iodine for boo boos
Put together your own and chances are you will know how to use what is in it.
Remember non-stick bandages and vet wrap. I would include ibuprofen tylenol and antihistamine.
Flush open wounds with clear clean water.
Learn how to use a tourniquet properly!!!!!
Take a first aid class with NOLS I believe the classes are called Wilderness Medicine.