I try to get stuff in glass/aluminium bottles that I clean and reuse myself. It's not easy. Supermarkets is an immediate no-go (when I was young, our village supermarket sold Coke and Milk and other stuff from taps , so you just brought your own); now it's something impossible. But for local farmers, local springs etc it works well. Same for veg, fruit, meat, eggs etc; no plastic needed. Allows us to throw almost all our garbage in the compost heap, give to the chickens etc.

Back in the day, my father worked as a researcher for a large, old dairy company. He was tasked with finding out what was environmentally friendly for packaging milk; whether they should start offering milk in washable glass bottles instead of their current cartons, for environmental reasons.

He found that the environmental impact created by the washing of the glass bottles was worse than the impact of the entire production and disposal cycle for the cartons. If you added in the production of the glass, the recycling of glass when it broke, and the extra impact from transport (less space due to not being able to pack as well, heavier) there was no competition at all - glass was way, way worse.

Plastic was a bit better than glass, and carton was the best available option. So they stayed with carton.

This was ~30 years ago, mind, so the equation may have changed. But I still find it important to check before deciding "Let's go glass" is the right option.