Why carry a separate trauma kit? There are a number of good reasons to have this type of gear in its own container. First, it speeds up first aid application. You have the needed supplies in one pouch ready to go at a moment's notice. Another point to consider is if someone is bleeding profusely, you're going to get blood (and maybe other fluids) on all of the gear in a single-compartment medical bag. And a third reason, if you needed it, is that it keeps unnecessary gear out of your way as you attempt to save a life. You don't need to be rummaging around through the band-aids or little pill packages when somebody's bleeding out.