"I think the difference is that flight opened up quick trips where you might want a bag with just enough clothing for a few days." Traveling salespeople etc. w

"I think the difference is that flight opened up quick trips where you might want a bag with just enough clothing for a few days." Traveling salespeople etc. would often go on relatively short trips, even in the steam engine era. We underestimate mobility of pre-WWII people by a lot... The point about simpler clothing is really interesting. I can imagine that this could be the crucial difference.