Specimen Containers Case of 400. This container is designed for safe, secure collection and transportation of biological specimens for laboratory evaluation. The container features accurate, easy-to-read, molded-in graduations on three sides. Top and bottom ribbed etchings ease the opening and closing process when wearing examination gloves. Containers are flexible, crack-resistant and are manufactured from virgin, high clarity, chemically inert, medical grade polypropylene. Heavy duty polyethylene screw caps feature a unique dual fill circle thread design which provides a tight, leak-proof seal.