I suggest a diaper bag, preferably with a hazmat symbol on the side. Range bags and tool bags are great, but they scream "valuable stuff waiting to be pawned." If you have to leave one in the car, it could attract thieves. I don't know of any dirty diaper thieves, though.
A gunfight is not the time to learn new skills.
If you ever have a real need for more than a couple of magazines, your problem is not a shortage of magazines. It's a shortage of people on your side of the argument. -- Art Eatman