Manufactured of polypropylene, these autoclavable boxes are stackable for sample storage in 1.5 to 2.0ml microtubes and 1.0 to 2.0ml cryogenic vials. Boxes can be used at temperatures from -90°C to +121°C and are autoclavable. Boxes feature a hinged lid connected to the base and a locking system to ensure secure closure. A molded alphanumeric grid allows for easy identification of samples. Dimensions of cryo boxes are designed to be compatible with vertical, horizontal, and drawers style freezer racks. Each pack includes two yellow boxes and two blue boxes.