As we say on the Farm – “Glass is Class”! Glass bottles can be used again and again and again. The only energy consumed in this process is the energy required to wash and sterilise them. This is a lot less than the energy required to manufacture and deliver a plastic container. Because glass is made of silicone, they do not require that fossil fuels need be involved at any stage, unlike plastic.
It is better for the environment to re-use packaging than it is to re-cycle packaging. Re-use beats re-cycle.
Using too much milk for pint bottles to be practical? We can also deliver re-usable tubs.