In addition to a good travelling clothesline (a twisted bungee with little suction cups on both ends; carry 4 or 5 pair of socks/underwears and wash in the sink every few days; you’ll never suffer from jungle rot again), I never leave home without a tiny spray bottle.

A quick spritz with water does wonders to relax wrinkles out of clothes, for those times when you don’t want the rumpled look. My sprayer (from the Muji store in Tokyo) is the size of a lipstick, and lives permanently in my Dopp kit.

It took me years to get down to the one-bag level, but as others above have attested, once you do it’s soooo liberating. Although I still haven’t gotten down to just one pair of shoes…