b the movable platform 470 is used to support a bioreactor as seen in fig1 control panels 469 a b c are used to raise and or lower the movable platform 470 in embodiments of the invention movable platform 470 is replaced with a movable ceiling or roof of the stacking unit fig5 is a side view of the system 500 of fig1 for illustrative purposes a schematic user 501 is shown facing the front of the system 500 as with fig1 the system 500 is shown in a closed or storage configuration housing or storing bioreactors the component parts of the system 500 can be seen to be the base unit 52 the stacking unit 540 and the guard unit 560 from this perspective it can be seen that the base unit 520 is accommodated within the lower chamber of the stacking unit 540 which is itself partially surrounded by or received within the chamber of the guard unit 560 use of the system of embodiments of the invention as depicted in fig1 to 5 will be described with reference to fig6 to 19 below it is expected that the system will be maintained in a clean area such as a tissue culture suite or biomanufacturing facility to minimise the risk of microbial contamination bioreactors will be housed or stored in the system until such time as it is necessary to carry out work on them and.