this post was submitted on 23 May 2025
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There are no cardboard container for liquids — cardboard soaks and dissolves in water. What you are likely refering to is tetrapak, a compound material made of plastic, aluminium and cardboard. I think I've seen packages using only plastic coated cardboard without aluminium as well. You can test it yourself: just rip it apart and you can examine the layers of the compound material.
I don't know about the impact of production — paper production still destroys woods, needs lots of water and energy, aluminium needs tons of energy. Probably better than glass and worse than PET?
Transportationwise they are as good as PET, probably better.
Regarding recycling they are a nightmare, it's almost impossible, because you have to separate the three layers which are designed to stick together. Tetrapak claims they are recycling them, but this technique is fairly new and I've got no idea how well it works and how sustainable it is.