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.