Does Nalgene Wide Mouth bottle have microplastics?

Bottles & drinkware

Moderate exposure

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

Grade C60% confidenceTritan copolyester bottle with a polypropylene cap

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

Higher than a steel bottle, because here the whole bottle is the polymer, not just the lid. Tritan is BPA-free, which is a different question from particle shedding — and this is a bottle designed to be reused hard for years.

Made ofTritan copolyester #7 Polycarbonate #7

Why Nalgene Wide Mouth bottle scores 49

The entire water-contact surface is polymer, unlike a steel bottle where only the lid is
Designed for years of reuse, and mechanical stress raises release from plastic bottles measurably
Dishwasher cycles, drops, scratches and clipping to a pack all accumulate surface damage
Frequently left in hot cars and on sunny trails, which is the condition that matters most

Where the 49 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: 20 / 30
Use conditions: 16 / 25
Measured release: 8 / 25
Polymer behaviour: 5 / 10
Processing: 0 / 10

Total exposure49 / 100

What we don't know

Tritan specifically has not been tested for particle release. The Winkler reuse finding is on PET, a different polymer with different mechanics. "BPA-free" is well documented and is a claim about a leached chemical, not about particles — the two get conflated constantly, including by people selling bottles.

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.

Steel bottle with a simple cap

same durability, no polymer wall

Glass bottle with a sleeve

if it is not going in a pack

Check the one in your hand

This page scores Nalgene Wide Mouth bottle 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-reviewed2019
Winkler 2019 — Refilling and mechanically stressing PET bottles measurably increased particle release compared with first use.
Limitation: A laboratory stress protocol rather than observed household reuse. It establishes direction — reuse of single-use PET makes things worse — more firmly than magnitude.
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 Nalgene Wide Mouth bottle have microplastics?

How was the Nalgene Wide Mouth bottle score of 49 calculated?

Five components, added: packaging contact 20/30, use conditions 16/25, measured release 8/25, 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 Nalgene Wide Mouth bottle 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 60%?

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.