Robot arm, robot having a robotic arm and packaging apparatus

A robotic arm comprising a first arm portion, a second arm portion, the second arm portion moveable between a first axial position, in which the first arm portion and the second arm portion are mutually spaced from each other along said axis, and a second axial position, in which a first end of first arm portion and a second end of the second arm portion are in contact to define a housing, a head rotatable with respect to the first arm portion and around said axis; and a robotic joint. The joint is configured for adopting an operative condition, to make the second arm portion integral with the head. The robotic arm is configured so that said operative condition corresponds to said second axial position and said second angular position and the robotic arm is configured so that, in said operative condition, the joint is located within said housing.