[drache]

it's made out of reclaimed wood pulp - a waste product in paper making - and it's a lot like unformed paper nuggets
it's very absorbent
it bio-degrades and can be composted
poops can just be picked off
it's a pretty inoffensive colour (grey), but also comes in a full spectrum of colours for those humans who prefer a less natural look
it does smell a tad acidy when I first open the bag, but other than that it doesn't smell and it does the job as far as controlling animal odours
it seems to last a long time with minimal maintenance

the downside is that it's sometimes hard to find the snakes in it