I purchase the 500ml bottles for the storage of extra virgin olive oil. The bottle is thick and heavy. The dark color will insure to protect the oil from light. It also makes it difficult to see when it needs refilling. I knocked off one star because the included pourer (spout) is not very good. It pours slowly and drips slightly. I tried to substitute a standard oil pourer, but it did not fit. Still this is a very good bottle and I recommend it.