A single-piece side-loading box having triple side-wall construction and a unique latching tab. The box incorporates walls, a floor, a top, a side-opening panel and latching tab in one unitary piece. The one piece box generally includes a bottom panel, front, side and back panels attached to the bottom panel and a lid attached to the back panel. A latching tab with integral handle is incorporated into the front panel. The box is preferably assembled from a cutout made from a single piece of material. The side-walls, side wings and side reinforcements fold into each other to provide a triple-side-wall construction that allows the box to support a great weight.