Tedlar® bags are the bag of choice for most professionals for collecting a wide variety of gaseous compounds. Tedlar® bags are referenced for many US EPA Methods including 3, 18 and 0040. Bags fabricated from Tedlar® film are inert to most gases, resist gas permeation and can be reused for most applications after proper cleaning. They are flexible and strong but we still recommend a rigid container to ensure longer life and for convenience during transport. Tedlar® bags are fabricated from transparent 2ml. film or can be special ordered fabricated from opaque black Tedlar® for photosensitive compounds. Custom sizes available upon request.