Nantes to Palermo tour 2009

Riding dozens of miles with something on your back is, imo, not a great idea.

I use a camel back type thing when MTBing and love it, however I do need to clean it regularly even though I only use water, I'd imagine it would be hard on tour.

It is totally flat against your back i have ridden well over a century with a camel back and had no problems it weighs nothing at all
and in terms of cleaning dont be stupid and put something sweet in and i have used mine for over 3 months with out a problem only filing and refilling it with water it will be fine

I cant reccomend them enough!