My first few years I carried it all! I've now gotten to the point where I just take a few necessities and let them be responsible for the rest. It sucked to carry around a 25 lb bag! I used to carry around medications, and would let the kids have it if parents said ok. Don't do that anymore, too much of a risk now a days.
A list of the stuff I do still carry: extra pair of socks, extra bow, lipstick, small hairspray, comb, fingernail clippers, tiny bottle of nail polish remover. Everything else I carry is for me aside from waivers (if needed at that comp) and music.