The only really dangerous situation long term is high humidity, especially with cellulose media which doesn't like water much. Before I purloined my wife's Foodsaver, I would stretch a nitrile work glove over the open end of the new filter with a packet of desiccant in there for long term storage. If you bleed the air out of the glove, the filter can be stored in it's original package. I do the same thing with my used filters (since I have a used glove after the OC, it gets a second job) after draining as it prevents them from drooling all over while awaiting proper disposal.
BTW I am usually 230 or 265 grain ( : < ).