Stanley Sortmaster Organizer from Amazon.com.. upper left, new blank cartos, lower left, new prefilled cartos, bin just above lower left for cartos to be cleaned, lower right paper towels and tools and Q tips, upper right misc. storage, center bins for individual eliquids and cartos filled (condoms on) and ready to be used.. when cartos are used and need refilling they go back into the same bin holding the eliquid used with the condoms off.. that way I know they need refilling and I avoid mixing cartos with odd combinations of juices.. during the life of the carto the same juice is always used to refill
