not give or flex inward as downward pressure is applied to the finger tabs this contributes to the easy deployment of the access means 20 in the preferred embodiment illustrated the tear lines 30 are of arcuate configuration they are curved or arched concavely toward the end wall 90 the tear lines 30 intersect a frangible or otherwise weakened line 32 that is formed in the side end flaps 76 and 78 to extend between the side walls 64 and 66 entirely across the end wall 90 thereby defining a retaining portion 95 of the end wall 90 the tight packing of the carton 12 and or the rigidity of the composite top wall provides tension in the carton walls which may restrain the cans u2018 c u2019 of the uppermost row from rolling free from the carton 12 when the access means 20 is first displaced or detached from the carton 12 the protruding part of the composite top wall may also assist in retaining the end most can of the uppermost row within the carton 12 as the access means 20 is deployed furthermore the configuration of the weakened lines 32 provides an opening which is shaped such that cans u2018 c u2019 of the lowermost rows are restrained from.