Cryovials are small, specially designed containers used for storing biological samples at extremely low temperatures, typically in liquid nitrogen. Made from durable materials like polypropylene, these vials can withstand freezing conditions without breaking or leaking. They often come with secure, leak-proof caps to ensure sample integrity. Cryovials are used in laboratories for preserving cells, tissues, and other biological specimens for research or medical purposes. They are marked with labels for easy identification and may include features like self-standing bases or screw caps for added convenience.