I put together a first aid kit a few years ago and have added to it as different needs have arisen and I learn about more ways to treat them. Waterproof gun box, deep type with upper tray. Most of the time these items are in it and with me:

Granulex, Happy Jack Onex dressing, Sulfodene, Bag Balm, Iso alcohol, Vet wrap, Electrolyte fluids, Nutri-Stat paste, charcoal tabs, breathable med tape, duct tape, sharps, B-12, rubber gloves, gauze and clean rags. Penn G is in the fridge.