A packaging comprising: - a first main panel, a first side panel, a second main panel, and a second side panel, defining a box body and being separated from one another by folding lines formed on a flexible material sheet, - at least one closure cover for said box, wherein the closure cover includes a tongue projecting from a closure panel in turn projecting from the first main panel, the closure panel being separated from the tongue and from the first main panel by folding lines, - the tongue being configured to be introduced into the box under the second main panel, and wherein through the tongue at least one elongated window is provided, - a lug projecting from the closure panel and being arranged coplanar with it, - a first dust panel projecting from the first side panel and a second dust panel projecting from the second side panel, wherein each dust panel (11a, 11b) is provided for turning about a folding line and is configured to be arranged under the closure panel of the cover, and - a first tooth being arranged coplanar with the first dust panel and a second tooth being arranged coplanar with the second dust panel, and wherein the teeth (12a, 12b) are configured to extend through the window and to project from the window as said cover is closed, characterized in that - the second main panel, which is arranged opposite to the first main panel, comprises a first preset breakage line for facilitating a separation of a portion of the second main panel, and - each dust panel (11a, 11b) includes a second preset breakage line along a portion of the respective dust panel (11a, 11b), wherein the second preset breakage line extends along the whole dust panel (11a, 11b) from a first side to an opposite second side, wherein neither the first side nor the second side are in the form of a folding line or an outer contour of the dust panel (11a, 11b), which outer contour is parallel to the folding line between the dust panel (11a, 11b) and the respective side panel (3, 5). - a first main panel, a first side panel, a second main panel, and a second side panel, defining a box body and being separated from one another by folding lines formed on a flexible material sheet, - at least one closure cover for said box, wherein the closure cover includes a tongue projecting from a closure panel in turn projecting from the first main panel, the closure panel being separated from the tongue and from the first main panel by folding lines, - the tongue being configured to be introduced into the box under the second main panel, and wherein through the tongue at least one elongated window is provided, - a lug projecting from the closure panel and being arranged coplanar with it, - a first dust panel projecting from the first side panel and a second dust panel projecting from the second side panel, wherein each dust panel (11a, 11b) is provided for turning about a folding line and is configured to be arranged under the closure panel of the cover, and - a first tooth being arranged coplanar with the first dust panel and a second tooth being arranged coplanar with the second dust panel, and wherein the teeth (12a, 12b) are configured to extend through the window and to project from the window as said cover is closed, - the second main panel, which is arranged opposite to the first main panel, comprises a first preset breakage line for facilitating a separation of a portion of the second main panel, and - each dust panel (11a, 11b) includes a second preset breakage line along a portion of the respective dust panel (11a, 11b), wherein the second preset breakage line extends along the whole dust panel (11a, 11b) from a first side to an opposite second side, wherein neither the first side nor the second side are in the form of a folding line or an outer contour of the dust panel (11a, 11b), which outer contour is parallel to the folding line between the dust panel (11a, 11b) and the respective side panel (3, 5).