Tedlar Bags are the industry standard for collecting soil vapor samples. Our 1L Gas Sample bags are made of high-grade polyvinyl fluoride (PVF) film. This high-performance, biaxially oriented film is known for its durability, resistance to weathering, chemicals, and UV degradation. Utilizing a lightweight, single-fitting of inert polypropylene that offers a simple twist design to open and close the valve. The isolated corner grommet provides a simple solution when hanging samples or securing samples together during transportation. These sample bags are most commonly inflated using a vacuum inflation box; however, other solutions, including syringes, have also been used. Peristaltic pumps can be used in many cases when inflating with a vacuum box but should not be used in direct alignment sampling because of possible VOC contamination from the silicone line tubing.SPECIFICATIONS: Sample size: 1 Liter Bag Dimensions: approx 7" x 7" FlatValve connection: .17"-.19" Tapered tube (Fits most 1/4"OD Tubing)Material: PVF