Abstract: Aspects of the disclosure relate to a packaging system, an apparatus (400; 500; 600; 700) for forming a package, an article carrier (90; 190; 390; 490) for packaging one or more articles, a blank (10; 110; 310; 410A-B) for forming the carrier, and to a method of packaging one or more articles. The carrier (90; 190; 390; 490) comprises a main panel (12; 112; 312; 412) having one or more article retention structures (RT1, RT2) for receiving and securing the main panel (12; 112; 312; 412) to a respective article (B). The carrier (90; 190; 390; 490) comprises at least one panel having a peripheral edge, a portion of which provides at least one registration edge shaped to inhibit movement in two orthogonal directions when engaged by a reference device (440; 540; 640; 740) of a packaging apparatus (400; 500; 600; 700).