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You just need to add a thin layer plastic on the inside to prevent that from happening! Then it’s no longer plastic-free, but it’s still reusable and greatly reduces the amount of plastic needed compared to disposable cups.
Do they work, though?
You just need to add a thin layer plastic on the inside to prevent that from happening! Then it’s no longer plastic-free, but it’s still reusable and greatly reduces the amount of plastic needed compared to disposable cups.