The invention concerns a device designed to secure packaging strips round packets of individual items, using a flexible element with a joint zone which runs at right angles to the wrapping direction and which can be bridged by the securing device. The securing device consists of locking strips which are detachably connected to each other and which have interlocking drawing-in and clamping means plus a handle, one element of which is attached to the free end of one locking strip while another element is attached to the free end of another locking strip which works in conjunction with the first. In order to provide a device of this kind which is simple in design and easy to use and, in addition, offers a high degree of security against accidental opening, the invention proposes that the first element (1) is a strip-shaped element with teeth (2) and that the second element (3) is a securing unit with an insertion channel for the first element (1) and a flexible arm (4) which extends into the insertion channel to act as a lock catch. The flexible arm (4) extends along the insertion channel and its free end points towards the end of the insertion channel which is remote from the end at which insertion takes place. Mounted on the securing unit is a pivoting handle (7) by means of which the flexible arm (4) can be bent out of engagement with the first element (1) and by means of which the flexible arm (4) can be locked in unflexing engagement with the first element (1).