The invention provides a carrier for holding a plurality of containers, comprising: panels that extend at least partially around an interior of the carrier, at least one bottom panel, a front panel, a back panel, and at least two side panels; a divider flap foldably attached to the back panel and the front panel, wherein the side panels, the back panel, the divider flap, and the front panel are arranged to at least partially define at least two container-receiving spaces of the interior; and a retention panel pivotable relative to the back panel for retaining a least one container of the plurality of containers, wherein the retention panel is upthrusted to upwardly foldable by shifting the divider flap out of the plane of the back panel and contacting with the retention panel.