A box-shaped (BOX) pot, which had two 44 cm slit all-web entrances at the ends, and a dome-shaped (DOME) pot, which
had two open funnel entrances with a rigid metal-framed orifice (15 cm width, 8 cm height) at each end, were the two collapsible pot designs used (Kagotoku Shiroyama Kenmousha, Ise,Japan; see Fig. 1).