A sterile bioreactor is formed of a combination of a bag and a bubble diffuser retained in the bag. The bubble diffuser is formed of a microporous sheet material that produces substantially uniform micro gas bubbles for enhancing plant organism growth within the bag. The bag is made in a cost-effective manner and with desired sterility by sealing coupling devices and/or ports, the tube ends sealed and gamma irradiated. The coupling devices/ports are established in one side wall of the bag. Contents may be inserted into and removed from the bag through the coupling devices/ports, which may be surface mounted portals.