Our self-sealing sterilization pouches have a strong single seal that offers extra protection against bursts and allows a fiber-free opening. They are punture resistant and have built-in multi-parameter internal and external steam indicators which change colors only when all 3 parameters; time, temperature & saturated steam have been met. EO indicators change colors when all 4 parameters; time, temperature, relative humidity & ECO concentration have been met. The blue tinted see-through film allows for quick detection of pinholes or tears.