Thought I dont carry one with me now, I am a certified EMT, so if something does go wrong I can pretty much take care of it. I do carry a pair of EMT shears, gauze, bandages, bandai's. And a bunch of other medical crap in the map pouches on my UTG tac vest. I plan on getting the Blackhawk drop leg medic pouch, it has more room for me to carry a widder range of supplies.
Once I have that, I will also get a back pack to carry more stuff, like Glucose, C-collars, Sam-Splits, Stethascope, BP Cuff, Non-Latex gloves, ect. Of course, thats when I get the gear...wich could take god knows how long...haha.