Posted By:
fkwI keep the bulk of my cards in a large fireproof Gun Safe (for rifles, 5' tall and weighs a ton 
). I recently moved most of my cards from the cardboard boxes I used to have to some small stackable see-through Tupperware like storage boxes (Walmart). I dont have to write on them whats in them because you can see everything inside, plus these are semiwaterproof too.
Where I live in Puna district on Big Island... even wetter than the wettest city (Hilo) in US, Im more worried about the 5-10 inches of rain a week, than a fire . We get about 250 inches a year on average.