The application discloses a round baler for forming a bale from a crop product, comprising a first bale forming chamber (600) provided with a first bale forming mechanism, a second bale forming chamber (700) provided with a second bale forming mechanism, a working unit, comprising a rotor rotatable around a rotor axis of a feeding mechanism (612), a transfer unit, and a density control mechanism (640), configured to detect a density of a preformed bale in the first bale forming chamber (600), wherein one or more sections of the first bale forming chamber provide for one or more control elements of the density control mechanism. Further, a method for forming a bale from a crop product is disclosed.
