A combustion chamber (30) comprising an opening device for a compressed gas tank (21) of a hybrid inflator (20), wherein the combustion chamber (30) comprises a sleeve-type combustion chamber sidewall (34) confining a combustion chamber interior (31) and a combustion chamber bottom (10), wherein the opening device is arranged on a surface (11) of the combustion chamber bottom (10) facing away from the combustion chamber interior (31) and faces away from the combustion chamber interior (31), wherein the combustion chamber bottom (10) is tightly connected to the combustion chamber sidewall (34) so that during operation the combustion chamber bottom (10) is bendable.