I never thought of this until recently taking my erolls out. Changing elevations seems to make mine leak. I took six fully assembled ones with me and they all leaked and had not before that. Its really weird because I haven't thought of the eroll as a pressurized system. There's, obviously, something I don't understand about the way they work as I would never have thought reversing the batt in the PCC would make it leak from the cone seam but it does (as Joye has said it would).
Uh oh. I have a flight coming up soon. Should I anticipate leakage on the plane?