Abstract: A reinforced box, with adjustable dividers, the box having a bottom wall, and laterally extending upright, opposite end walls, the box also having longitudinally extending, upright side walls and partition walls extending between and connected to the opposite end walls; there being angled slots cut into the side walls and partition walls to intersect the tops thereof, the slot extending at acute angles relative to a top plane defined by the tops of the side walls and partition walls; and panel-shaped dividers carried by and extending between certain of the longitudinally extending walls, each divider having wings respectively received in two of the angled slots, and the dividers having lower portions extending below the levels of the wings and slots, and between the longitudinal walls; whereby the dividers and longitudinal walls between which they extend form cells to receive cards in ordered face-to-face relation.