No matter if one detail for the day or more, same should be there to be used as needed.
One each of a rotary and a DA, and at least two pads for compounding and polishing for each.
Compounds and polishes and final wax/sealant.
Towels for grunge work, polish work and final wipe downs.
Towels for glass work.
Brushes to clean wheels, tires, interiors, etc.
All purpose cleaner, some wheel cleaner, etc.
Dressing, one that is non-dimethal silicone that works on interiors and tires, trim.
A small air compressor.
A good, with power vac.
At least 50 feet of 12 gauge extention cord. Two is better than one.
Spray bottles and dispensor bottles for all products which require them.
Yes there are other small items, the point being that as posted, if you think ahead and use the "bottle crates", you can carry more than you think, "if truly organized" in the putting it all together.