Duo-Check™ Pouches contain internal and external Type 1 indicators that change color when processed, are easily visible, and are compatible with steam sterilization (indicators turn from pink to dark brown) and EtO sterilization (indicators turn from green to gold/brown). The pouches are manufactured from medical grade paper and blue-tinted transparent film which provides instrument viewing and identification of punctures or tears in film. An extra-wide chevron protects against instrument breaching and the perforated fold helps ensure the adhesive strip forms an airtight seal upon closing. The thumb-notch makes for easy opening and the six corner tack seals prevent curling and other potential contaminants from entering pouch upon opening. Once sterilized, contents will remain sterile for up to 3 years provided the integrity of the pouch has not been compromised. Double pouch validation verified.