There are a few things to consider when choosing a bottle for olive oil. The first is the type of olive oil. Extra virgin olive oil is the highest quality and has a lighter color, while lower quality oils are darker. The second consideration is how the olive oil will be used. If it will be used for cooking, then a dark colored bottle is best so that the light doesn't degrade the quality of the oil. If it will be used for salads or as a finishing oil, then a clear or light colored bottle is better so that you can see the color and quality of the oil.