Specially designed for collection, transport and storage of specimens. The uniqueness of the SecurTainerÖI is that it incorporates a unique tamper-evident screw cap using a tab locking mechanism. Containers are uniquely stackable, shatter resistant and are manufactured from virgin, polypropylene. The magenta lids are ribbed for easy opening when hands are wet or gloved while the jars are stackable for easy, safe storage and almost transparent to allow specimens to be viewed without opening.