Crown Bees Mason Bee Accessories Humidifier Storage Container, Humidibee Easily stored in the refrigerator to provide an ideal hibernation environment at a 39-40 degree f (4 degree c) temperature Moisture absorbing pad ensures a humidity balance of 60-70% so cocoons do not dry out Simply add a tablespoon of water monthly for safe humidity level Holds about 1,500 spring mason bee cocoons Safe for your bees and reusable each year