Wife and I carry 2 of these
MSR Fuel Bottles in the frunk (1 in each Spyder). I'm still not sure what I think about this safety-wise, but we've already needed them once.
30 oz is 1/4 gal roughly... 1 of them should take us 7-8 miles which around here will get us somewhere to fill up. Further from civilization they're not nearly as useful.
Those TourTubes look great! A 1.5Gallon 16"x6" fits in the frunk or on the back. Their 1/2 Gallon 4"x11" is only a little bigger than my MSR tubes and hold just over twice as much.
Had I seen these I probably would have bought them instead.
That all said, we've both had them pop their tops in the summer heat in the frunk when sitting in a parking lot for an extended time. Make sure you leave MORE than enough expansion room inside. The MSR bottles are made to pop the top when this happens instead of bursting. My rain gear permanently smells like Shell Premium. Those TourTubes don't look like they'll pop their top, more likely it'll find a weak weld... or maybe nothing will happen at all. Leave lots of air just to be sure.
As far as wrecking, I figure the tank on the Spyder isn't any tougher than these MSR bottles. If the frunk gets smushed and one pops open, it's only 30 oz of fuel tops. If something's going to catch the Spyder on fire, it'll do the same thing with 30oz as it does with vapors from the evil cannister... poof, no more Spyder. Doubt it'll do any worse than that (won't explode or anything more dangerous than a fire already is.)
Strapping one to the sportrack might be safer. In a crash it will likely detach and skitter around, probably without rupturing unless it gets pinned between vehicles or something. At that point I'd be more worried about where *I* was than the fuel bottle
ray:
