You can experience that the taste of Bailibao (the plastic bag you mentioned) is obviously better than that of Tetra Pak (the milk in the 250ML carton you mentioned). Packaging material: the price of tin foil packaging is higher than that of plastic packaging, so the latter is higher than the former, which is normal.

However, personally, I think the price of the latter is a bit high, which is normal between 54 and 58. Due to regional differences, 60~~62 is acceptable, but the price of 67.2 is on the high side, and the price of 220ml*20 packs in 28 yuan is very reasonable.