Abstract: A packaging unit includes: a first section defining a first recess therein and a slot disposed at a side thereof situated opposite the first recess; a second section elongated with respect to the first section, being connected to the first section and defining a first fold therebetween, the first section and the second section together forming an L shape in an unfolded state of the packaging unit, the second section further defining a second recess therein having a shape identical to that of the first recess and being disposed such that, when the first section is folded onto the second section along the first fold, the first recess and the second recess register with one another for forming an aperture for engagement with a hanging element; a third section connected to the second section and defining a second fold therebetween; a fourth section connected to the third section and defining a third fold therebetween, the fourth section further defining a single recess therein corresponding to a shape of at least