Everything I have.
At my last SP National, I brought 6 pairs of pants, 6 powder blue shirts, 5 white ASA Under Armour Heat Gear shirts, 5 indicators, 5 brushes, 3 line-up card holders, 3 hats, 2 belts, 3 pairs of shoes, 6 pairs of socks, 5 or 6 pairs of compression shorts, and 2 cups. I also bring anything I need to maintain all of that: scrub brush and soap for the hat and plenty of shoe polish.
And my house was only an hour away.
I'm prepared. Always. I'm ready to completely change out my uniform at a moment's notice so that I never miss a beat.