A packaging container includes a pallet, an enclosure box, an enclosure base, a sheet, and a set of fasteners. The pallet carries the article thereon. The enclosure box rests on the pallet to enclose the article therewithin, and includes a top wall, first and second pairs of opposite side walls, an open bottom, and a first set of through-holes. The enclosure base lies between the article and the pallet to hold the article. The sheet extends across at least a portion of the pallet and the first pair of opposite side walls to secure the pallet to the enclosure box when fastened to the enclosure box, and includes a flat center panel, a pair of side flaps, and a second set of through-holes. The set of fasteners are passed through the first and second sets of through-holes to fasten the sheet to the enclosure box from outside the enclosure box.