Get your fresh milk delivered to your door, in glass bottles (the old school way)
Stop buying your milk in disposable packaging, plastic or even Tetrapack. Glass bottles are much better as they can be reused easily.
Depending on where you live, a lot of companies offer milk delivery services, the old school way. You can get your daily fresh milk, delivered in a glass bottle to your door. Also, leave your empty bottles in front your door and the milkman (or milkwoman) will take them away and reuse them! Easy!