V v interesting - believe me or not (!) I bought a 110mm plastic drainage tube and screw-cap just a couple of days ago with this very idea in mind!
The Arrow exhaust on my XT600 is about 110mm diameter, so in terms of pannier location I had to make room for this on one side anyway. Easy enough to keep the same spacing and fit the same diameter tube on the other side. At 50cm long the tube has an internal volume of a bit less than 5lt.
It's completely watertight so great for gear or - when needed - converts into water tank. Ta daaa!
Was going to make up a false 'exhaust' out of 1mm ally sheet, and use this to hide/protect the screwing end cap.
Downside is that the tube/cap feels like about 2kg, although yet to put it on the scales. Also not especially cheap at £50 for two screw caps, four feet of tube, two end caps (non-screw) and solvent cement.
Also got one for the front (but 45cm long) as toolbox.
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Barry
3AJ Tenere
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Barry
XT600Z 3AJ Tenere (rebuild in progress)
SRX600
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