The science is in: humans are now ingesting roughly a credit card's worth of microplastics every week. A 2019 study from the World Health Organization found microplastics present in both bottled and tap water, with bottled water containing roughly twice as many particles per liter.

But the story goes deeper than water bottles. Microplastics — particles smaller than 5 millimeters — are now found in our soil, our seafood, our salt, our honey, and even the air we breathe. They come from synthetic clothing fibers, tire dust, industrial pellets, and yes, plastic bottles.

For something you're meant to drink 2-3 liters of every day, water is the cleanest place to start. The question is: what kind of water, and what kind of container?

Studies published in Environment International (2022) detected microplastics in human blood for the first time — 77% of test subjects had measurable amounts. A 2023 study found microplastics in human lung tissue, breast milk, and placental samples.

The long-term effects are still being studied, but early findings suggest potential links to inflammation, endocrine disruption, and metabolic disorders.

This is why the container matters as much as the water. Even the cleanest spring water, packaged in plastic, picks up microplastic contamination along the way. Glass doesn't. It's inert, it's reusable, and it doesn't shed.