An apparatus for packing containers includes a generally rectangular pallet adapter comprising rows and columns of cups, the rows and columns of cups being substantially orthogonal to each other, each cup comprising a lower portion that is generally circular and an upper portion that is generally rectangular, the pallet adapter including side walls located on its perimeter, the side walls extending upward beyond the cups; and a detonation barrier disposed on the pallet adapter, the detonation barrier the detonation barrier comprising internal row partitions, internal column partitions, two end row partitions and two end column partitions, the internal row partitions and end row partitions being substantially orthogonal to the internal column partitions and end column partitions thereby defining rows and columns of rectangular openings.