1) A page must change a decision
Each page exists only if it changes what you put in the bag: layers, shoes, adapters, liquids strategy, or redundancy.
2) Climate is treated as risk, not vibes
We explicitly call out what goes wrong: wet wind, AC indoors, altitude dryness, or heat + humidity.
3) Checklists are local-first
No accounts. We use localStorage for simple persistence and let you reuse a base list across trips.
4) Airline pages are caution pages
Rules change. Airline pages emphasize verification and bag strategy rather than fixed measurements.