Robot arm, robot having a robotic arm and packaging apparatus

There is described a robotic arm (20) comprising a first arm portion (21), a second arm portion (22), the second arm portion (22) moveable between a first axial position, in which the first arm portion (21) and the second arm portion (22) are mutually spaced from each other along said axis (X), and a second axial position, in which a first end (28) of first arm portion (21) and a second end (29) of the second arm portion (22) are in contact to define a housing (24), a head (26) rotatable with respect to the first arm portion (21) and around said axis (X); and a robotic joint (23). The robotic arm (20) is configured so that the second arm portion (22), in said second axial position, can be subjected to a relative angular movement with respect to the first arm portion (21) and around said axis (X), between a first angular position and a second angular position. The joint (23) is configured for adopting an operative condition, to make the second arm portion (22) integral with the head (26). The robotic arm (20) is configured so that said operative condition corresponds to said second axial position and said second angular position and the robotic arm (20) is configured so that, in said operative condition, the joint (23) is located within said housing (25).