I use the new materials rather than the old cotton stuff.
For one cotton item eg jeans I can pack two of the newer material pants - zipp off legs too so they double as shorts. The shirts will dry over night - at the end of the day have a shower - as you shower wash your cloths ... wirn them out and hant them up .. Put on your secnod set and have dinner etc. teh next day .. ware either set. Ok the pants take a little longer to dry .. but hung inside out they sar still wareable the next day ..
I take 3 sets - ware one, second set for wareing while No 1 drys and the third as a spare. As you are constantly moving (almost) no one will notice you're wareing the same things day after day ..
The larges item .. shoes and toiletaries. Every thing else is very small .. pack teh inside of the shoes with socks and undies .. Most couple settle on one pannier each .. the tank bag gets camera pens etc, the rear rack gets tent, cooking gear.
Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S