Megazorb is really good, you will find a lot of members on here use it. If you give your bunny a cat litter tray and litter train him/her then you could use megazorb or newspaper and hay in the litter tray, then a towel or fleece for the rest of the cage. I have used old towels in my hutches for some time with the litter trained buns. I just pop them on a hot wash and it makes cleaning out so much easier and far less messy.