a foaf always stores his ethereal solutions in a freezer.
it never happened that the glass broke or that the thing
exploded. (glass only breaks when filled with water, since
it is one of the few substances that expand on cooling and
ofcourse _all_ solutions should be tightly closed, so no risk
of fumes either)
as for storage: as long as it's tightly closed, no problem
in a cool (<=25°C) place. of course there is some pressure
build up, but with increased pressure boiling point does
increase too. don't use a normal glass stopper without
clamp though, or you know what happened when it makes
"popp..........................clank"