I use a large storage tub. I had a sterilite one previously and just switched to an IRIS. I don't have pictures of my actual holding tub, but it looks exactly the same as my breeder tubs. (I only have a few rats for breeding)
It works well.
http://img.photobucket.com/albums/v9...f/IMAG0728.jpg
http://img.photobucket.com/albums/v9...f/IMAG0774.jpg