Plastic bottles with a capacity of 2.3 litres contain the most liquid for the lowest packaging weight and could reduce plastic waste by thousands of tonnes per year
Source:
https://www.newscientist.com/article/2269358-plastic-bottles-holding-2-3-litres-are-least-harmful-to-the-planet/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home