A sustainable container includes panels attached to one another to form sidewalls surrounding a central space, and flaps extending from the sidewalls to form a bottom. A divider panel attached to at least one of the panels has upper and lower portions separated by an opening. The container is assembleable from a knockdown state, in which the upper and lower portions of the divider panel are disposed substantially in a single plane of the divider panel, to an assembled state, in which the upper and lower portions of the divider panel are folded in opposite respective directions out of the plane. The upper portion of the divider panel separates first and second cells of the container, and the lower portion of the divider panel separates second and third cells of the container, when the container is in the assembled state.