I have a Yemen Chameleon and i recentley purchased 2 bags of the 10l of this coarse substrate. i found that the bags contained large amounts of the bark, i found it covered my chameleons enclosure with a good covering of a few inches. i found that this substrate was different from others that i have purchased in the past, this is because unlike others this has already been cleaned so it doesnt leave your reptile all dirty and covered in mud. i have also found that this substrate is excellent for reptiles that require a high level of humidity as the bark is able to absorb high levels of water. The water that is retained enables the bark to stay moist and help keep the humidity levels up. in addition the choice between coarse and fine is great as some reptiles may not need to have high humidity so the fine would be used as this will hold less water than the coarse version.