UltraCruz® CryoBoxes are commonly used for ultra-low temperature storage of both internally and externally threaded cryogenic vials. They are made of durable polycarbonate and can be an economical alternative to flimsy cardboard or expensive stainless steel storage boxes. The usable temperature range is -196°C to 121°C, so they can be put in a freezer, fridge, or autoclave. CryoBoxes fit into stainless steel racks and accept writing with markers. UltraCruz® CryoBoxes are also compatible with UltraCruz® Cryoracks that are sold separately.