I put my portable aqua in a tiny glass vial (found in some craft shops here - it looks like a tiny version of what some herb containers look like ) and this is sealed with a tiny cork (came with the vial ). This seems to work quite well too. No leakage and i can stuff 24 of those potable aqua + some cotton wool inside. Fits pretty well in my psk.<br><br>Anyone have any idea if PA will erode cork ?<br><br>