What worked for me best with packing sport bikes was to get cheapy soft panniers (I have a couple of sets, but the best were second hand Oxford Sport ones I got off ebay for a tenner), and then a smaller bag over the top ... the main reason was I found it hard to secure a single large bag to the bike without it wanting to slide off to the side.
Are you planning on using campsites or just finding a place at the side of the road? Some places that isn't a problem, but others where it is (for example here there's no problem camping, but having a fire is a big no-no)
Remember in most of Europe outside of cities the opening times can be esoteric, and almost non-existant on Sundays.
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FreeBSD fan since before it was cool ...
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