These straight-sided jars are ideal for soil sampling and environmental applications. Straight-sided walls allow for complete removal of contents. Jars are manufactured from Wheaton 800" glass, which meets USP Type III standards. A variety of caps are sold pre-attached to the containers or are available separately. Cap and liner combinations include white polypropylene with PTFE faced polyethylene or polyvinyl liner and black phenolic with rubber liner. Black phenolic cap with rubber liner is autoclavable.