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Vapor Barrier Evidence Pouches are ideal for packaging and storing chemicals, controlled substances, paraphernalia, and volatile materials. Barrier Pouches are useful in a wide variety of applications for evidence collection. These heat sealable pouches are constructed of a combination of films with ideal barrier properties. This barrier eliminates cross-contamination while protecting individuals from exposure to dangerous substances such as PCP and methamphetamine. When properly sealed, the pouches provide a heavy-duty, airtight, and puncture resistant evidence container for collecting, transporting, and storing evidence. They are exceptionally strong, crystal-clear, and are absolutely liquid, air, and vapor tight.