A package (1) for containing loose items comprises at least one outer casing (2), at least one inner casing (3) accommodated slidably within the outer casing (2) and capable of motion between a closed configuration, in which an opening (4) presented by the inner casing (3) is concealed completely by the at least one outer casing (2), and an open configuration in which the opening (4) is exposed at least in part. The package (1) further comprises at least one connecting appendage (5) hinged along a first line to a side wall of the outer casing (2), and along a second line to a side wall of the inner casing (3) breasted in sliding contact with the side wall of the outer casing. The outer casing (2) comprises a locking part with a flap (6) folded to act against a corresponding locking part of the inner casing (3) also comprising a flap (7), both flaps (6, 7) in folded state being attached to the outer casing (2) and the inner casing (3), respectively. The two locking parts prevent immediate opening of the package from the closed configuration to the open configuration and wherein said part of the outer casing (2) is thicker than said part of the inner casing (3).