Maybe I missed something? Rotopax is a very well known company; mainly in the Adventure/Touring sector but many use them for general sport touring as well. Not the most aesthetically pleasing option; but it does give you the ability to carry a bit of extra fuel (or water) if you were so inclined.
Is there something missing here or was this topic a spam post in itself? Rotopax is a pretty big deal in the adv market and for those who want to go the distance and are wary or running out of fuel.
Check them out here: Fuel Cans : Gas Pack : Gasoline Containers : RotopaX.com - this may help?