I've always made it a point to be prepared. This also includes fire extinguishers and first aid/trauma kits. In my truck, I carry a self made first aid/trauma kit. Most first aid kits are loaded with bandaids, lotions and aspirin. I wanted a kit that was better suited for job site or outdoor injuries. Like injuries from livestock, chainsaws, job site tools, gunshot or knife injuries. So, I put together a hybrid kit that has bleeding care supplies (clotting gauze etc.), tourniquet, sucking chest wound, splint, eyewash as well as a reasonable set of band aids.
I also made every member provide an emergency contact number.
What does everyone else do for first aid/trauma kits?