Back to the original post: critique of a general first aid kit. Not every kit is good for every activity.

I like to think about the mission the kit is going to be part of: is it a home based kit for SHTF? Is it a backpacking kit? Is it a travel kit to distant, and not well supported lands for a scuba diving trip? Is it a vehicle based kit? What wounds, injuries, etc are likely to occur in those various scenarios? How far away is professional support (EMS/Fire Department/Search and Rescue/Hospital)? In a regional disaster they're going to be swamped and delayed.

In each scenario I have basic supplies which I view as personal protective items (gloves, mask, cleaning wipes/iodine solution), trauma (roller gauze, gauze pads, triangular bandages, tape), tools (shears, tweezers, magnifying glass). Then I customize per the mission.

I've taken a dive trip to a very remote island that only gets one flight a week and doesn't have a decent clinic. In that case I carried extra supplies for injuries common with scuba diving and included 2 suture kits (not for me to use but for the clinic to ensure what they're using on me is sanitary). I also included anti-diarrheal medications etc useful for foreign travel. This was a very significant and large kit but NOT good for backpacking. It was designed to support 2 people for 1 week on a trip. When I left I gave it to the dive operator as a gift as it wasn't needed for the remainder of my journey.

Backpacking kit is the smallest kit I have. It only has the very basic supplies.

Car kit is larger and has more trauma dressings & more roller gauze, an Ace wrap, etc.

Home kit is a large plastic tub filled with supplies. I use it for home, disasters prep, and to restock the other kits.