A honeycomb protector for protecting the corners or edges of articles during shipping of such articles comprising a flat panel including first, second, third and fourth portions which are foldable to form the protector. In one embodiment, the fourth portion includes a finger which fits within a notch in the third portion for connecting the third and fourth portions together co-planarly when the protector is folded. The portions are preferably foldably connected to each other by crush slit scores. The crush slit score foldably connecting selected portions has a bevel angle in a preselected range providing a spring-biasing action between the selected portions when the panel is folded. The spring biasing action causes the finger to lock in the notch to assure that the protector does not unfold while the article is being packaged for shipment.