During my last visit to the dollar tree store, I found these mini staking bins (multi functional), and decided to try them as bunk beds. While the top one has not yet been used (I think I may need a ramp for it - the bottom one does. I put a remnant of fleece and the pggies like to go in and cuddle with it! Sorry - not enough room to fit 2 pigs in the same bin at the same time!