The perforated fold facilitates the precise folding of a wide self-adhesive strip to form an airtight seal. Internal and external multiparameter process indicators for steam sterilisation respond to three variables: time, temperature and saturated steam. The multiparameter process indicators printed directly on the pouch confirm sterilisation parameters. The blue-tinted film makes it easy to view instruments and detect punctures or tears. A convenient thumb notch makes it easy to open the pouch without contaminating the contents.