opening receives and or limits the motion of the lip to lock closed the cover application_number US 47415999 A description carton blank 10 fig1 includes side panel 18 front panel 16 side panel 14 rear panel 12 and glue flap 30 separated respectively by scorelines 24 26 28 and 50 top scoreline 20 separates panels 18 16 14 and 12 from top flaps 36 40 44 and 50 bottom scoreline 22 separates panels 18 16 14 and 12 from the bottom panels 38 42 46 and 48 tab 54 extends from one end of carton opener 52 which comprises parallel lines of weakness 56 58 extending through panels 18 16 and part of panel 14 at the opposite end of carton opener 52 diagonal line of weakness 62 extends to scoreline 20 at the other end of carton former 52 prior to reaching tab 54 diagonal line of weakness 60 extends between the upper edge of carton former 52 and upper scoreline 20 between upper line of weakness 56 of carton former 52 and upper scoreline 20 are disposed on panel 18 and 14 debossments 60 62 these debossments are situated so as to lock or at least substantially lock into place lips on a carton liner as will be seen below alternatively an embossment or an opening may be used the embossment limits.