The Prusa Mendel Kit arrived in a brown cardboard box measuring 20" x 11" x 8", weighing about 20 pounds. Inside were a number of smaller boxes that contained the actual parts. The parts in the smaller boxes were grouped by type. For example, all of the printed parts came in one of the smaller boxes. The rods came in a cardboard tube. Everything was neat and organized.
The only suggestion I have for NWRepRap is to pack the outer box in another larger box. The power supply was slightly damaged because it was positioned right at one of the corners of the outer box which got a bit dented.