Delivering milk in glass bottles and collecting them for reuse the next day has a very long tradition in my country (the UK) but this practice has largely died out with the consolidation of dairy farms into huge units and the rise of supermarkets.I think we should avoid packaging foods in the plastic containers, because man has not discovered the reactions of the numerous chemical and biological subsistence of the various foods with the molecules of the different plastics. I have not traveled to Japan to see which kind of things Japaneses use for keeping milk but I think stainless metals such as aluminum or some type of steels and also glass are the bests. The defect of the glass containers is that they are breakable and transporting, carrying or using them should be done carefully.
Delivering milk in glass bottles and collecting them for reuse the next day has a very long tradition in my country (the UK) but this practice has largely died out with the consolidation of dairy farms into huge units and the rise of supermarkets.