A self-locking package comprising a sleeve having a self-initializing locking tab and a slidable insert. The sleeve comprises a plurality of panels forming a substantially quadrilateral cross section. The locking tab extends between a top panel and a bottom panel and is offset from corners of the quadrilateral. An insert for retaining an item is at least partially insertable within an opening of the sleeve and includes a notch formed in at least one portion of the perimeter of the insert, such that when the insert is properly inserted into the sleeve, the locking tab seats within the notch to substantially prevent relative movement between the insert and the sleeve.