My luggage for a month RTW, MP Renfrew 2016(not the fan)

You have to be able to carry everything up & down many flights of stairs at train stations + hotels without elevators.
Little packets of baking soda you can get along the way (near flour & sugar in little markets) work well as shoe powder (light) & unscented detergent: otherwise laundry-soap perfumes can permeate the rest of your clothes + diminish oxygen intake,
not so good for carrying luggage up & down stairs.

If you’re in another country with another language, try asking for ‘BEE-carbonate soda,’ and it rings a bell.