stiffly or rigidly in the region of the container openings 9 a 9 b 9 c 9 d 9 e 9 f so that the 9 a 9 b 9 c 9 d 9 e 9 f have a stable shape and glands or connectors optionally connected thereto remain leaktight two of the container openings 9 a 9 b may be fluidically connected to one another by a fluid line 5 so that circulation of the content of the bioreactor container 1 by transport of fluid from one of the container openings 9 b to the other one of the container openings 9 a through the fluid line 5 is possible the circulation is preferably carried out by means of a circulation pump not shown through the remaining container openings 9 c 9 d 9 e 9 f the bioreactor container 1 may for example be filled and emptied the bioreactor container compartment 25 shown in fig1 is essentially rigid and preferably made of a corrosion resistant material for example stainless steel a fluid permeable and or structured reception sheet 7 can be inserted into the bioreactor container compartment 25 along an introduction direction e the reception sheet 7 in the embodiment shown comprising two layers 7 a 7 b which can be arranged above one another the bioreactor container 1 can likewise be introduced along the introduction direction.