A process bag container is provided comprising a flexible bag, at least one inlet sealed to the bag, and an outlet. A probe housing for a probe construction is sealed to the bag. Preferably, the probe housing extends at least partway into the bag interior and is connected to a cable for power and data transmission that runs along the outer surface of the bag to the top of the bag or its support container. The probe construction is adapted to monitor the composition of a reagent in the bag as well as the environment within the bag. A mixer is positioned within the bag to effect mixing of reagents in the bag.