I've gotta say, when I first got the Tuff jugs, I wasn't very impressed with their solidity. They crumple when empty and blow up nearly round when pressurised (eg with fuel in them, in the heat/sun). If they are sitting in my trailer at the track, I unscrew the cap a little bit to release the pressure. The previous (non Tuff, non quick pour) jugs I got from MCAS were much more solid. But I've still never had an actual issue with Tuff, although as they age I'm getting slightly more concerned....