Cryogenic labels for identifying the side of microcentrifuge tubes. These cryo labels are available for thermal-transfer and direct thermal printers, and can be printed with 1D or 2D barcodes and alphanumeric text. Their special shape allows the label to be affixed partly onto the conical portion of the tube, maximizing the amount of printable information. They are designed to withstand extended storage in cryogenic conditions, including liquid nitrogen (-196°C), lab freezers (-80°C), and transportation on dry ice.