Independent of which track I’m going to: small screwdrivers, pliers, micro files, sand paper, x-acto knifes, tweezers, pinion puller, pinion press, caliper, micro scale, iron brush, cotton swabs, lighter fluid. Spare everything; tires, gears, pinions, motors, pickup guides, axles, braid …..
Depending on the track I’m going: soldering iron, variable power supply, tire truer, comm lathe.
I normally have all the tools I use for slot separate from my other tools and I keep the slot ones on the pit box.