I've always worked on the rule - buy the smallest you can get away with. If you get big ones "just in case" you might carry more stuff, you will end up carrying more stuff! You can always stick a dry back on the top of each if you need extra space.

Also be careful with the width. I would strongly advise against getting anything that is going to be wider than the width of the handlebars. Most 40L+ cases will be wider than the Tenere's bars. I have Holan 38L cases and they are about the same width as the stock bars, and a little under if you include the extra width of the Barkbuster handguards. Do some measuring before you hit the buy button.

This thread sounds like a good excuse to dig out the old pannier disaster video! Makes me laugh every time/cringe every time I watch it...

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