A unitary plastic container, which is optionally used for waste collection comprises a base, a front wall, a back wall and two opposing side walls, each wall extending upwardly from the base to define an open container top and an interior container volume. Each side wall has an outwardly extending sidewall portion which is outwardly offset relative to the rest of the container side wall. In each outwardly extending sidewall portion, an elongated cutout, indentation or channel is present. The elongated channel has a forward opening, a rearward opening and an elongated side opening extending from the forward opening to the rearward opening. The elongated channel lies within the interior container volume and divides the outwardly extending sidewall portion into two areas: an upper outwardly extending sidewall portion and a lower outwardly extending portion. The outwardly open elongate channel may be fitted with a reinforcing sleeve.