17/09/2026
In 2021, we wrote about microplastics being released from paper coffee cups.
At the time, people told us we were “fear-mongering.”
PLA (polylactic acid) bioplastic-lined cups came onto the market, and many saw them as THE solution.
Now, a 2026 study from The University of Queensland has found that PLA-lined paper cups exposed to hot water released around 4.3 million nanoparticles per millilitre.
By mass, they released around 12 times more plastic material than PE-lined cups.
Bioplastic doesn't automatically mean microplastic-free.
At I'm Plastic Free, we’ve been researching and writing about microplastics in everyday consumer products since 2018.
The simplest solution?
Use a ceramic, stainless steel or glass mug.
Our research is linked in the comments.