We used a little sandwich container and filled it with "yesterday's news" kitty litter - our hedgehog actually uses his litter box (most of the time) however he still also poops on his wheel. Haven't tried fleece before - let us know if it works!I would love to make a litter pen for my Kiwi. I want to know that he will use it before I go buy one, so I was wondering if any of yall had a good, easy diy pen. Also, I would like to use fleece for the "litter". Thanks in advance!!!