A container comprising an insert and a sleeve which encloses the insert is disclosed. A blank of resilient sheet material comprising a first, second, third and fourth sequential adjoining rectangular panels are folded along their three shared side edges to form the sleeve having a rectangular cross-section, with a locking tab adjoining the first rectangular panel. An insert having a rectangular cross-section slightly smaller than the sleeve cross-section, and a mating locking tab are configured such that when the front end of the insert is substantially inserted into the front end of the sleeve, the back edges of the sleeve locking tab and the insert locking tab abut one another such that the insert may be removed only upon application of pressure at opposed locations on the exterior of the sleeve to cause the sleeve to bow outward and away from the insert.