I used to have a top level IFA ticket and with all that gruesome training and treating a couple real world bordering on gruesome injuries, i figure the most important thing in a small kit is a drainage dressing. Which, come to think of it isn't much more than a sanitary napkin with long ties on it so you can cinch it up tight to get enough pressure to stop a bleeder. I follow the old loggers MO and carry one inside my fallers hardhat.

I pack an outdated IFA kit in the truck and a cigarette pack sized kit in my pack that my wife bought for me somewhere. Its kinda cheezy, but it does have a drainage dressing In the past I've just made a little kit in a zip lock by either raiding a bigger kit (a no-no) or buying a few things including a d dressing from a first aid supply place.