Folks, We carry the largest made bottles into the field for work which is the 30 OZ MSR fuel bottles. These bottles rock for toughness and are pressure vessels so they don't leak. Exception is if the caps O ring fail :-(. We immediately replace the safety caps they come with, with normal ones. The only down side is 30 OZ isn't all that much fuel if you are boon-docking for days and/or heating water for showers. Boon-docking is what we do 90% the time. As others have stated, HDPE plastic is not bothering by gasoline fuels.