One embodiment is directed to an article carrier (300) and a second embodiment is directed to a blank (100) each comprising: a plurality of walls or panels, respectively, hingedly connected to one another; at least one opening (120) for receiving the neck (N) of an article (A), said opening (120) being formed in at least one of said walls/panels, comprising: an aperture (122) that is defined by aperipheral edge (E), said aperture comprising: a collar (C) extending along a portion of said peripheral edge (E), said collar being defined at least in part by said peripheral edge and by at least afirst relief line (124a) and a second relief line (124b) each spaced apart from said peripheral edge, said collar being deflectable to variably and reversibly enlarge said aperture.