These high-quality non-graduated lab containers are designed for the collection, transport, and storage of specimens and samples. Tight fitting lids prevent leaks and odors. Ideal for storing biologically hazardous samples for terminal autoclaving before disposal. Molded from either high-density polyethylene or polypropylene, these containers are inert to most chemicals including formaldehyde, weak acids, and all bases. The stackable containers are resistant to freezing and boiling and are easy to write on with either pen or pencil for positive identification.