Disposable bioreactor, kit for the same and method for its production

A cap of a disposable bioreactor which is connectible to a container, said cap comprising a cap surface having an upper side and a lower side, said cap surface being limited by a circumferential collar projecting vertically relative to said lower side and attached to surround a fixation flange of the container, said lower side being provided with locking arms which coact with a corresponding fastening indentation of the container, wherein the fixation flange of the container has a bent end portion in the direction of an opening of the container forming the fastening indentation, the locking arms extending in a lateral direction from a bearing flange of the cap in the direction of the circumferential collar, said locking arms being resiliently shortable in their longitudinal direction in which the lateral extension of the locking arms is greater than the inner diameter of the fixation flange or the bent end portion, respectively, and the locking arms are adapted to engage the bent end portion of the fixation flange by way of a retaining surface.