A packet comprises an outer shell (0) and an inner shell (I) connected by a spring member (12). The outer shell (0) defines a cavity for receiving the inner shell (I) and comprises a bottom wall (4B), a front wall (1) and two side walls (3R, 3L) upstanding from respective edges of the bottom wall. The inner shell (I) comprises a front wall (11), a rear wall (7) and two side walls (8R, 8L), the rear wall being connected to the bottom wall of the outer shell. The spring member (12) is hingedly connected by a first hinge (H 1) at a lower portion of the front wall (11) of the inner shell and is hingedly connected by a second hinge (H2) to the inner surface of the front wall of the outer shell. The inner shell (I) is hingedly connected to the outer shell (0) by a third hinge (H3) at the said bottom wall such that the inner shell moves with spring action between closed and open positions.