A carrier (1; 101; 201; 901) at least partially holding a plurality of containers, each container of the plurality of containers comprising a flange, the carrier (1; 101; 201; 901) comprising: a plurality of panels extending at least partially around an interior of the carrier, the panels comprising a bottom panel (11; 111; 211;911), a first side panel (13; 113) foldably connected to the bottom panel (11; 111; 211; 911), a second side panel (17; 117) foldably connected to the bottom panel (11; 111; 211; 911), a first top panel (21; 121) foldably connected to the first side panel (13; 113), and a second top panel (25; 125) foldably connected to the second side panel (17; 117); at least one container-receiving feature (75, 77; 175, 177) extending in at least the bottom panel, the at least one container-receiving feature at least partially receiving at least two containers, wherein each container of the plurality of containers is positioned in one of at least a first column (96; 196) extending generally adjacent the first side panel and a second column (98; 198) extending generally adjacent the second side panel; and a first retention flap (29; 129) foldably connected to the first top panel and a second retention flap (33; 133) foldably connected to the second top panel, at least the first retention flap engages at least a portion of the flange of at least one container of the plurality of containers, wherein the first retention flap (29; 129) comprises a first proximal portion (37; 137) and a first distal portion (43; 143) and the second retention flap comprises a second proximal portion (39; 139) and a second distal portion (45; 145) the second distal portion of the second retention flap being at least partially in face-to-face contact with the first distal portion (43; 143) of the first retention flap, the first distal portion (43;143) of the first retention flap (29; 129) at least partially engaging the flange of at least one container in the second column, characterized in that each of the first proximal portion (37; 137) and the second proximal portion (39; 139) of the respective first and second retention flaps (29, 33; 129, 133) defines at least one opening (41; 141) that partially receives the flange of the at least one container in the respective first column (96; 196) or second column (98; 198); and the second distal portion (45; 145) of the second retention flap (33; 133) at least partially engaging the at least one container in the first column (96; 196) proximate the flange. a plurality of panels extending at least partially around an interior of the carrier, the panels comprising a bottom panel (11; 111; 211;911), a first side panel (13; 113) foldably connected to the bottom panel (11; 111; 211; 911), a second side panel (17; 117) foldably connected to the bottom panel (11; 111; 211; 911), a first top panel (21; 121) foldably connected to the first side panel (13; 113), and a second top panel (25; 125) foldably connected to the second side panel (17; 117); at least one container-receiving feature (75, 77; 175, 177) extending in at least the bottom panel, the at least one container-receiving feature at least partially receiving at least two containers, wherein each container of the plurality of containers is positioned in one of at least a first column (96; 196) extending generally adjacent the first side panel and a second column (98; 198) extending generally adjacent the second side panel; and a first retention flap (29; 129) foldably connected to the first top panel and a second retention flap (33; 133) foldably connected to the second top panel, at least the first retention flap engages at least a portion of the flange of at least one container of the plurality of containers, wherein the first retention flap (29; 129)