I've used eco earth, repti bark, adorn, and paper towels. Eco earth and repti bark is good for humidity and they can burrow but I keep going back to paper towels. Just in case my snakes do get mites from being out side sense I take them out all the time it's easier to see mites and my snakes seem to like the paper towels for some reason. Not to mention it holds humidity pretty well and easy clean up.
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