Eco Pet Bed

Following on my information gathering quest I use eco cardboard bedding for my mice and hamster instead of wood shavings. Does anyone use this for their bunnies? Its quite cheap as it comes in 20kg bales, straw might be cheaper though. Just getting a feel for whats best for them.

You can use it for rabbits, i haven't tried it myself though, I am currently using Hemcore for all my small furries!