I usually bring my main fretted bass, my fretless, and my backup fretted. If/when I purchase a 6, I'll still bring three basses; the 6, my main fretted, and my fretless. I always have extra cords, strings, fuses, batteries, pliers, VAC tester, allen wrenches, and a screwdriver on me. My head has a DI on it, but if my head dies, I'm in trouble until I can fix it, which is why I have my VAC tester to check the outlet, and extra fuses just in case the tester missed something. Overkill? I don't think so. I still want a DI just in case too...