Abstract: A non-reopening fastener includes complimentary first and second profiles of substantial length and disposed adjacent to one another so as to be pressed into interlocking relation. The first profile includes first ribs including a main rib and two outer ribs disposed on opposite sides of the main rib. The first ribs include hook members along the width of the first ribs. The second profile includes two inner ribs adapted to be positioned between the outer ribs and the main rib. The two inner ribs have projections for engaging the hook members. The second profile also includes a pair of guide ribs disposed on opposite ends of the second profile. The first profile engages the second profile to lock the profiles together. The above configuration prevents the first profile from being pulled out of the second profile without damaging the fastener or a bag to which the fastener is attached, thereby providing evidence of tampering.