I've got a messenger bag that I always keep my dice in, that's also my primary day-to-day bag that I take to school or stick stuff in when I go out.
I've got this LL Bean tote bag that I keep a bunch of minis, two big binders and whatever books I expect to need.
Finally, I carry a plastic bag or two filled with minis.
Oh, and I've got a portfolio I made out of poster board and duct tape to carry maps and keep them flat.