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TIL about East Germany’s extremely durable drinking glass
(ceramics.org)
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this post was submitted on 27 Sep 2026
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The article also mentioned soulbottles, which is modern recreation of these east Germany glass cups.
https://soulbottles.com/
Very cool.
I'm not finding any claim of superior durability on that site. The statements about material say that they now use more recycled glass and have reduced emissions by 75% compared to the original soul bottle. All of which makes me doubtful that they are still using the Superfest process.
But maybe I just missed it, or they're actively hiding a major selling point for some reason.
This is the only conclusion I could come to as well. They have it on their kickstarter, but not on their website, which is full of hippie stuff (neutral) instead for some reason. The old version didn't use the process, and the new version does, but only according to the kickstarter about it.
https://www.kickstarter.com/projects/paulkupfer/ultraglass-stronger-and-lighter-bottles-with-ion-technology
I have a low tolerance for inconsistent messaging like this. Sketchy
Looking at the updates posted on their kickstarter, they're saying the project failed and the brand has been taken over by a different company https://www.kickstarter.com/projects/paulkupfer/ultraglass-stronger-and-lighter-bottles-with-ion-technology/posts/4480077
Oh sad. But yeah, not buying that!