Polycarbonate boxes for ultra-low temperature storage of both internally and externally threaded 1.2, 2.0, and 5.0mLcryogenic vials. For 25 and 81 vials. Durable, economical alternatives to flimsy cardboard. Usable temperature range of -196°C to +121°C. Transparent lids have printed grid for inventory purposes, permit viewing of contents and are keyed to prevent misalignment. Boxes accept writing with markers designed for ultra-low temperatures, such as Nalgene™. Cryoware markers, Cat. No. 7-6313. Unique 5 x 5 array for 1.2/2.0mL cryogenic vials. Creates small, space-efficient storage system within a large mechanical freezer. Useful as sturdy, reusable mailers for vials. Autoclavable.