Most of the time I would say that my number one travel tip is to have two of everything1 so that one set is packed at all times.
But honestly, the best tip is that everywhere has convenience stores. Underwear is cheap and can be hand washed.
Pack what cannot be replaced first; don’t stress about the rest.
This is mostly about phone/laptop chargers and toiletries. Just keep a bag with each packed and store it in your luggage. ↩︎