An adapter set for use in combination with a collapsible beverage container (40; 40'; 40") and a beverage dispensing system (10; 10'; 10"), said collapsible beverage container (40; 40'; 40") containing a beverage and having a specific shape and being collapsible by exposure to overpressure, said beverage dispensing system (10; 10'; 10") including - a housing defining an inner chamber, - a pressurizing device communicating with said inner chamber for pressurizing said inner chamber, - a cooling device communicating with said inner chamber for cooling said inner chamber, and - a tapping device (20, 22, 24) including a tapping handle for operating a tapping valve, said tapping device (20, 22, 24) communicating with said inner chamber for receiving a tapping line extending from said inner chamber to said tapping device (20, 22, 24), said adapter set comprising - an insert (42, 44, 49; 42', 44', 49'; 42", 44", 49") defining an outer shape matching to the inner shape of said inner chamber and allowing said insert (42, 44, 49; 42', 44', 49'; 42", 44", 49") to be received within and positioned within said inner chamber said insert (42, 44, 49; 42', 44', 49'; 42", 44", 49") defining a cavity for receiving said beverage container (40; 40'; 40") and for positioning said beverage container (40; 40'; 40") in a specific orientation within said inner chamber, and - a piercing device (50; 50'; 50") to be positioned juxtaposed said beverage container (40; 40'; 40") and to be maintained in said position juxtaposed said beverage container (40; 40'; 40") by said insert (42, 44, 49; 42', 44', 49'; 42", 44", 49") and including a cannula (50; 50'; 50") for piercing said beverage container (40; 40'; 40") in said juxtaposed position, said cannula (50; 50'; 50") being connected to a tapping line constituting a component of said adapter set or alternatively being connectable to a tapping line constituting a component of said beverage dispensing system (10; 10'; 10"), said tapping line serving to transfer said beverage from said beverage container (40; 40'; 40") to said tapping device (20, 22, 24) by collapsing said beverage container (40; 40'; 40") due to exposure to said overpressure inside said inner chamber. - a housing defining an inner chamber, - a pressurizing device communicating with said inner chamber for pressurizing said inner chamber, - a cooling device communicating with said inner chamber for cooling said inner chamber, and - a tapping device (20, 22, 24) including a tapping handle for operating a tapping valve, said tapping device (20, 22, 24) communicating with said inner chamber for receiving a tapping line extending from said inner chamber to said tapping device (20, 22, 24), - an insert (42, 44, 49; 42', 44', 49'; 42", 44", 49") defining an outer shape matching to the inner shape of said inner chamber and allowing said insert (42, 44, 49; 42', 44', 49'; 42", 44", 49") to be received within and positioned within said inner chamber said insert (42, 44, 49; 42', 44', 49'; 42", 44", 49") defining a cavity for receiving said beverage container (40; 40'; 40") and for positioning said beverage container (40; 40'; 40") in a specific orientation within said inner chamber, and - a piercing device (50; 50'; 50") to be positioned juxtaposed said beverage container (40; 40'; 40") and to be maintained in said position juxtaposed said beverage container (40; 40'; 40") by said insert (42, 44, 49; 42', 44', 49'; 42", 44", 49") and including a cannula (50; 50'; 50") for piercing said beverage container (40; 40'; 40") in said juxtaposed position, said cannula (50; 50'; 50") being connected to a tapping line constituting a component of said adapter set or alternatively being connectable to a tapping line constituting a component of said beverage dispensing system (10; 10'; 10"), said tapping line serving to transfer said beverage from said beverage container (40; 40'; 40") to said tapping device (20, 22, 24) by collapsing said beverage container (40; 40'; 40") due to exposure to said overpressure inside said inner chamber.