An adapter for dispensing a plurality of vertically stacked, interfolded sheets is disclosed herein, the adapter being configured to fit within a standard vertically-stacked dual roll dispenser. The adapter includes a housing having an interior adapted to receive a plurality of vertically stacked, interfolded sheets. Each sheet may include a leading edge and a trailing edge separated by spaced-apart side edges. The housing may include a front wall, a back wall spaced apart from the front wall, and two spaced-apart side walls, each side wall extending between the back wall and the front wall. The housing may further include a bottom wall including a boss that extends upwardly into the interior of the housing. An opening having a width dimension is formed in the front wall, the opening adapted to dispense vertically stacked interfolded sheets from the interior of the housing. The side edges of the sheets are urged inwardly by the width dimension of the opening as the sheets pass through the opening. A door may also be provided, the door being pivotably attached to the housing.