The word baggage comes from the Old French bagage, from baguer — to tie up bundles. Everything you own that you chose to bring. The bag you carry is the first thing that moves when you do. It hits the overhead bin, the hotel room floor, the taxi trunk. It gets weighed, measured, tagged, scanned, and wheeled across more surfaces than most furniture ever sees. A good bag disappears into the trip. A bad one becomes the trip.
The carry-on changed travel the moment airlines started charging for checked bags. Suddenly the constraint was not weight, it was volume — and the travelers who figured out how to live out of one well-packed carry-on for two weeks became a different category of traveler entirely. The bag forces decisions. What actually needs to come. What can be bought there if needed. What can be worn twice. The bag is not just storage — it is a discipline.
The pilots figured this out first. A pilot's bag goes everywhere and gets unpacked and repacked in hotel rooms at 11pm after a long day. Efficiency is not optional. Everything in it has a reason. Nothing is there by accident.