+1 on the shopping bag cover.. my brooks spent a summer outside only covered by a shopping bag, I've since made a silnylon cover, but a bag tied on the bottom, inspected for holes is 100% reliable.But my leather saddles have gotten soaked more than once and survived to provide years of service, so I'm not too worked up about it. I've tied a plastic shopping bag over it too.
You should relube your chain every 100 ish miles anyways so getting your bike wet on a longer trip should be no problem(as you would be prepared).
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