Does Owala FreeSip have microplastics?

Bottles & drinkware

Moderate exposure

Some plastic contact, but limited by material, temperature or contact time. Reasonable as a default.

Grade C58% confidenceStainless steel body with a multi-part polypropylene and silicone lid

0 · no plastic contact100 · constant contact

Two numbers, not one. Exposure is how much plastic contact this involves. Confidence is how much anyone has actually measured. How we score

The short answer

Same story as every steel bottle, with more of it: the body is inert and the lid is not. The FreeSip lid has more moving polymer parts than most — a spout, a straw, a hinge and a gasket — and all of them sit in or above the water.

Plastic lid or cap format profile

Why Owala FreeSip scores 33

Integrated straw and sip spout, both polymer, both permanently in the liquid path
A hinged lid with a latch — more sliding polymer-on-polymer contact than a plain screw cap
Marketed for all-day carry, so the contact time is the whole day, every day
Frequent dishwashing of a multi-part lid, which is where abrasion accumulates

Where the 33 comes from

Five components, added. The page renders the parts rather than a stored total, so the number cannot disagree with the reasoning behind it.

Packaging contact: 10 / 30
Use conditions: 14 / 25
Measured release: 4 / 25
Polymer behaviour: 5 / 10
Processing: 0 / 10

Total exposure33 / 100

What we don't know

No measurement exists for any bottle lid. The relative ranking between lid designs here is a judgement about the number of polymer contact surfaces and how much they move, not a laboratory result. We would rather say that than pretend the ranking is measured.

This section is on every page in the database, including the ones where the answer is comfortable. How evidence grades work →

Better options

Ordered by how much they change, not by how much they cost.

A plain screw-cap steel bottle

fewer moving polymer parts in the water

Glass bottle with a steel lid

lowest-scoring reusable we list

Check the one in your hand

This page scores Owala FreeSip as a product. Formulations, packaging and suppliers change, and the specific item you own has its own condition — a scratched pan and a new one are not the same object. Scan yours for a score built from what is actually in front of you.

Scan my bottles & drinkware

Sources behind this score

Each with the finding we use it for and the limitation that finding carries — because a study quoted without its boundaries is how this subject got so noisy.

peer-reviewed2022
Zangmeister 2022 (NIST) — Nylon bags, LDPE food-storage bags and similar single-use plastics shed trillions of sub-100 nm particles per litre in ordinary contact with water.
Limitation: Deionised water at controlled temperature. Nanoparticle counts are inherently large numbers; the study is about their existence and quantity, not their fate in the body.
peer-reviewed2020
Sobhani 2020 — Simply tearing, cutting or twisting open plastic packaging generates microplastics at the opening — 10–30 nanograms per 300 cm of tear.
Limitation: Mass, not particle count, and it does not follow whether those particles land in the food. It is the reason cap and seal design belongs in an exposure score at all.

Frequently Asked Questions

Does Owala FreeSip have microplastics?

How was the Owala FreeSip score of 33 calculated?

Five components, added: packaging contact 10/30, use conditions 14/25, measured release 4/25, polymer behaviour 5/10 and processing 0/10. The page computes the total from those parts rather than storing it, so the number cannot drift from the reasoning.

Is Owala FreeSip safe?

The score does not answer that and we will not pretend it does. It measures plastic contact, which is a physical property of the product. Whether a given level of exposure affects health is an open question — the FDA states the current evidence does not demonstrate a risk at the levels found in food, while research such as the 2024 NEJM plaque study gives real reasons to keep studying it. Both are true at once.

Why is the confidence only 58%?

No measurement of the product or its category exists. The score rests on published evidence about how this polymer behaves under these conditions — heat, abrasion, contact time, fat content. Because this is not a direct measurement of the product itself, the score should be read as a well-reasoned estimate that could move if someone tests it.