These jugs work! Even down under www.youtube.com/watch?v=N0uWb4NQfOY http://amzn.com/B011J17UZG Looks like they've been around awhile, but haven't heard or seen anyone else using them yet. They fit my Husky tanks fine and dump 2gl/8lt of fuel in @ 30 seconds No overflow spills or even a drip.
These work well for pit stops in longer hare scrambles. Keep the top parts cleaned up, store empty with lid cracked open. They only vent with the plunger compressed. I made the mistake of leaving one closed up and in the sun, actually split a seam.