Pack of four polypropylene boxes are designed for storage of samples as low as -90°C. Hold both internal and external threaded cryogenic vials with 1ml or 1.8ml capacity, as well as microtubes with 1.5ml or 2ml capacity. Designed to hold up to 100 vials in a 10 x 10 array. These stackable boxes provide a small, space-efficient storage system within a freezer. Include a transparent hinged lid with a secure locking closure. Autoclavable.