Abstract: A releasable fastening element for tying, bundling and fastening articles having at least one head element, including a longitudinally extending shaft with a leg extending from one end thereof to form a hook for engaging the material to be bound. The fastening element includes an elastic strap which is connected to the other end of the shaft. The elastic strap has locking elements placed at predetermined points along its length for individually and removably connecting the strap to a locking member. The locking member, which is located on the shaft, is formed by two oppositely aligned insertion grooves which are arranged parallel and adjacent to the shaft. The locking elements, which are wider than the grooves, are restricted from passing through the locking device, thus forming a loop in the strap for engaging the material to be bound. The locking member can also be formed as a sleeve with open ends mounted on the shaft parallel to the longitudinal direction thereof.