Are you attempting a zero waste life? It's challenging in Japan. In Tokyo, there are hakari-uri, bulk grocers. In Nakameguro - Hacari - https://store.hacari.jp/
In Kokubunji - Nue - https://www.nuebytotoya.com/
In Shibuya - Tap & Growler will fill your own growler with craft beer - https://www.craft-beers.shop/ Got more?!
Challenging is the word 😭 good to know there are some places in Tokyo where it's possible to buy in bulk. I don't know such a place where I live. Maybe farmer's market for vegetables and fruits?! so you can avoid all the unwanted plastic 😅