Copied my review for the FJCForums. For the full thread
http://www.fjcruiserforums.com/forums/4x4-off-road-tech/93008-rotopax-fuel-pack-jerry-can.html
UPDATE 2 - Review continuation
Well first let me say that I am more than happy with the money I have spent on this product. After my recent trip to NM for TOTH I am looking to purchase a set of the water packs as well from Rotopax...thats how impressed i was with their product.
I left from Houston, TX last Thursday night and filled with the Rotopax up at the local Costco as we headed out I-10. We were driving through the night and riding on trails as soon as we arrived Friday, so I figured it would be easier to fill them as we left Houston. Needless to say the Rotopax held up flawlessly on the 750 mile drive to Weed, NM. The only issue I had was the knocking of the straps which I hadn't tied off once fully tightened, but this was corrected by pulling off at an exit outside of Houston and tieing off the excess portion of the strap. Anyways we arrived in NM and I was happy to see that there was no sign of leaks on the fuel packs or the roof after the 12 hour drive!
Needless to say I didn't think this was a tough enough test yet for the rotorpax. Instead I decided to leave them on the roof for the entire duration of our trail runs rather than remove a few and store them at the campsite. I figured being in the sun all day and the afternoon heat would really test the fuel packs out. However, I actually tested them even more than I expected due to the fact that I filled the fuel packs in Houston which is basically at sea level and then drove to about 9000ft. I hadn't left much extra room in the pack for expansion due to heat let alone the altitude change!
Needless to say during the trail run on Friday I finally took the time to inspect the packs when we were on top of hanglider hill (name should give an impression on the elevation). The packs had expanded to a considerably and it looked as if the ratchet straps were a size 32 belt trying to fit around a size 40 waist individual. The straps were definitely putting a good amount of pressure ("squeeze") on the packs. At this point I was quite concerned about the packs leaking, but when I inspected further there were no signs of leaks. I was honestly quite surprised since the expansion due to altitude and heat was quite considerable.
Here are a few pictures of how I had them mounted on the roof.