What the Sri Lanka study found
Researchers reported microplastic particles in commercially bottled water samples from Sri Lanka. The study is useful evidence of presence. It does not by itself establish that the measured levels cause disease, nor does it prove that changing bottle material produces a specific health benefit.
What health authorities say
The World Health Organization has described important gaps in the evidence on microplastics in drinking water and called for more research. As the evidence develops, this site will avoid converting uncertainty into either reassurance beyond the evidence or alarm beyond the evidence.
What this means for bottle choice
Glass
The bottle body is not plastic, but closures or sleeves can contain polymers. Glass also brings weight and breakage trade-offs.
Stainless steel
The body is metal; closures and coatings vary. Verify the actual product specification and cleaning instructions.
Reusable plastic
Light and impact resistant. Where SLS 1616 applies, verify required certification and follow manufacturer care guidance.