Consider also that in much of Europe you cannot really do wildcamping, so you will be paying campsite fees every night. Between this, the inconvenience of carrying the camping stuff while two-up, and the inconvenience of setting up and breaking down tents every day, it may not be worthwhile for a Europe trip.
That said, I've successfully packed all my camping stuff into a single 19-liter drybag - for one person. For two people, traveling by car, we had a duffel bag for the camping stuff. 2-3-person tent (Coleman Festival in our case), two pads, two sleeping bags, inflatable pillows, cooking stuff.
This is the one I used for solo moto camping: https://www.louis.eu/en/speedbag-wit...umber=10068913 (mine is an older model but same thing).
This will fit two people's camping supplies easily: https://www.louis.eu/en/trekking-rol...umber=10068912
But then you have no topbox, nowhere to lock up helmets while you are off the bike, no backup storage to carry the day's groceries/water/etc.
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