My backseat driver and I have minimized our packing so that we can go on extended trips.
We stay with friends, relatives or @ motels (no camping anymore, is my backseat driver's rule for me). She used to ride her own bike...that gave us extra saddlebags but that was more than we really needed.
We use the low-side saddlebag for extra clothes. The high-side sidecase for raingear and extra layers. The topcase has our overnighter bag with our immediate necessities. And the nooks and crannies in all the storage has odds and ends like tools, first-aid, coolers, covers, snacks, water, etc.
It's a matter of function over style...do I have multiple T-shirts and underwear? No. One to wear and a couple spares and they are quick-dry. Wash in sink and dry by morning.
So I may look like I'm always wearing the same clothes but they're clean and, for me, THE FRONT SEAT DRIVER'S RULE IS NO TRAILERING.