I used Repti Bark for a while, and the Aspen shavings for a while too. The snake might like it because they can burrow, but I found it to be costly, messy and annoying for cleaning purposes. I recently bought the Reptile Cage Mat. I wish I had known about it before. It's very easy to clean, can be re-used over and over and doesn't make a mess at all when cleaning. I simply bought 2 pieces. I clean one and put the other in the cage. When it gets dirty I clean it and put the other one back in. That way I always have a clean one in the cage and I always have a clean one on backup. So the snake can't burrow anymore. It doesn't seem to matter to him, he has plants and Hide boxes to hide in.