Integrity Evidence Bag - 100 PackWaterproof Tear and puncture resistant Tamper proof seal Made of heavy duty, 3. 2 mil thick, multilayer, coextruded polyolefin film The manner in which evidence is stored and protected can often mean the difference between conviction and acquittal. With this in mind, Sirchie introduces the integrity evidence bag. These all in one bags are waterproof, tear and puncture resistant, printable and include a tamperproof seal. No other evidence bag offers