Automated analysis system with a reagent carousel and with exchangeable reagent containers of different sizes for liquid reagents, wherein ▪ the reagent carousel has a substantially circular carousel base area and compartments , which are radially arranged on this carousel base area , for receiving the reagent containers , wherein the compartments are delimited by radially extending dividing walls , which have at least one protrusion which points towards the compartment interior for engagement with a positioning groove or a positioning stop surface (16") of a reagent container , and ▪ the reagent containers are designed with a substantially circular sector-shaped, trapezoidal or triangular container base and container top and with container side walls which extend substantially perpendicularly from the container base to the container top and taper towards one another from a container rear wall to a container front side , wherein the container top has at least one sealable container opening , and at least one positioning groove or positioning stop surface (16") which starts from the container base and extends vertically in the direction of the container top is provided on at least one container side wall , characterized in that the reagent containers are to be inserted in a positionally stable manner into the reagent carousel without adapters and are selected from a) single-chamber reagent containers, which extend over the entire base area of a compartment , b) single-chamber reagent containers, which extend between a protrusion and a radially outer or radially inner boundary of a compartment , c) two-chamber reagent containers, which extend over the entire base area of a compartment , d) two-chamber reagent containers, which extend between a protrusion and a radially outer or radially inner boundary of a compartment , and e) multi-chamber reagent containers, which are located only in a part of the compartment delimited by a protrusion or fill the entire compartment , wherein both the reagent containers a) and the reagent containers b), c), d) and e) can be used in one and the same reagent carousel . ▪ the reagent carousel has a substantially circular carousel base area and compartments , which are radially arranged on this carousel base area , for receiving the reagent containers , wherein the compartments are delimited by radially extending dividing walls , which have at least one protrusion which points towards the compartment interior for engagement with a positioning groove or a positioning stop surface (16") of a reagent container , and ▪ the reagent containers are designed with a substantially circular sector-shaped, trapezoidal or triangular container base and container top and with container side walls which extend substantially perpendicularly from the container base to the container top and taper towards one another from a container rear wall to a container front side , wherein the container top has at least one sealable container opening , and at least one positioning groove or positioning stop surface (16") which starts from the container base and extends vertically in the direction of the container top is provided on at least one container side wall , a) single-chamber reagent containers, which extend over the entire base area of a compartment , b) single-chamber reagent containers, which extend between a protrusion and a radially outer or radially inner boundary of a compartment , c) two-chamber reagent containers, which extend over the entire base area of a compartment , d) two-chamber reagent containers, which extend between a protrusion and a radially outer or radially inner boundary of a compartment , and e) multi-chamber reagent containers, which are located only in a part of the compartment delimited by a protrusion or fill the entire compartment , <EOS>