EnviroSupply & Service Tedlar gas sampling bags are clear and made of 2mil PVF (Tedlar) film. Tedlar is tough, durable, and considered chemically inert to a wide range of compounds. Tedlar bags can be used for indoor air sampling, hazardous waste sites, leaking underground storage tanks, stack sampling, soil gas sampling, gas blending, calibration test standards, and most other gas sampling needs. All of our stock bags feature an eyelet and our patent-pending single 2-in-1 fittings that combine the valve and septum into one. Contact us for custom sizes. PRICE IS PER BAG.