Accomodates all 1.5mL and 2.0mL microtubes and standard 2.0mL cryovials. Designed with raised edges for secure, nonslip stacking. The lid opens and locks easily. Other features include: an attached lid that will not get lost, an alphanumeric matrix, and a frosted writing panel on the front. Available in an all-black version for use with light sensitive specimens.