Here's a first aid kit I put together about 6 months ago. I bought 4 of these boxes on eBay for about $1 each, and I have this large plastic tote - like the kind you put all your sweaters in - that I filled with first aid supplies that I've collected over several months. That box is my inventory, from which I build first aid kits of various sizes. This is not intended as a primary first aid kit, or even a back up. More like a back up to the back up. It is also intended as a FAK to give away, should you be outdoors and come across someone who is ill-prepared, if you see the need. If I were hiking, or trying to survive in a bug out, I would have 3 or 4 first aid kits of different sizes in different places on me. One or two would be in my BOB, and one in the leg pocket of my BDUs, and one in my coat or vest. My way of thinking is "If I become separated from my BOB in a worst case scenario, or have to watch it float downstream as I slip on a rock, what will I have left on me to survive with?" Cargo pants and a vest/field coat are for those bare essentials. Pictured are one intact FAK, and one opened. These are both the same.