formed of a sheet of paperboard such as solid bleached sulfate sbs solid unbleached sulfate sus clay coated newsback ccnb or recycled paperboard more preferably the paperboard has a thickness of between about 0 008 and 0 028 inch the blank 101 a includes a top panel 110 a bottom panel 120 and a subpanel 130 a side panel 116 joins the top panel 110 to the bottom panel 120 along fold lines 116 a and 116 b a side panel 126 joins the bottom panel 120 to the subpanel 130 along fold lines 126 a and 126 b end panels 112 and 114 are joined to the top panel 110 along fold lines 110 a and 110 b end panels 122 and 124 are joined to the bottom panel 120 along fold lines 120 a and 120 b end flaps 118 are connected to the side panels 116 126 the several panels 110 112 114 120 122 124 126 and 130 serve as body panels to form the general framework of the assembled carton 101 the fold lines 110 b 120 b as well as arcuate lines 110 c and 120 c are weakened preferably by perforations arcuate cut outs 132 and 134 are formed in the end edges of the subpanel 130 a cut line or perforated line 162 is formed in the top panel 110 and preferably intersects the fold line 110 a as shown the line 162 defines a release tab 160 a connecting panel 140 is joined to the subpanel 130 along a fold 140 a a locking panel 150 is.