Boxes withstand temperatures from -80°C to 121°C, and will not degrade with repeated thaws. Each box features an alphanumeric grid on the exterior and interior, stacking rings, and a matte surface suitable for markers or labels. Box top is clear for easy visual inspection of samples and bottoms are colored for additional identification and organization. Boxes accommodate 0.5, 1.5, and 2.0 mL microtubes, and most brands of cryogenic vials.