What to check first
Most problems are small until you do not have the part. A pump, plugs, tyre boots, chain link, tape, zip ties, and a proper multi-tool cover a surprising amount.
Practical ride notes
Practice using the repair kit before the trip. The middle of a wet lane is the worst place to learn a valve extender or tubeless plug system.
Before you click
Keep tools in a predictable place so they do not disappear under food or spare layers.