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Does Contigo AUTOSEAL travel mug have microplastics?

40/ 100

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
40
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

Middle of the pack, and it is entirely about the lid. A sealing travel-mug lid is a small mechanism with several polymer parts, and unlike a water bottle it spends its life full of liquid at 70–85°C.

Plastic lid or cap format profile

Why Contigo AUTOSEAL travel mug scores 40

Where the 40 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
12 / 30

What material touches the contents, over how much surface area, for how long. Glass and steel score near zero here; a film pressed against fatty food scores near the top.

Use conditions
18 / 25

Heat, abrasion, flexing, repeated opening, reuse beyond design life. The same bottle scores differently in a fridge and in a hot car.

Measured release
5 / 25

What a laboratory actually counted, for this product or its category. A high number here means real particles were measured, not that the material looks suspicious.

Polymer behaviour
5 / 10

How this specific polymer behaves — brittleness, fat solubility of its additives, thermal stability, whether it is a polymer named in existing restrictions.

Processing
0 / 10

What happened before you bought it. Retort sterilisation inside the pack, hot-filling, and pressurised brewing all happen at the most migration-favourable moment.

Total exposure40 / 100

What we don't know

The paper-cup study is the closest measured analogue — a polymer lining releasing particles into hot water within fifteen minutes — but a travel-mug lid is a much smaller polymer area than a full cup lining. We have applied direction from it, not magnitude.

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.

Stanley Classic vacuum bottle

steel interior, one simple stopper

Ceramic mug when you are not moving

the honest answer for desk coffee

Check the one in your hand

This page scores Contigo AUTOSEAL travel mug 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.

  1. peer-reviewed2021

    Ranjan 2021 — A disposable paper cup released roughly 25,000 micron-sized particles into 100 mL of hot water within 15 minutes — about the life of a takeaway coffee.

    Limitation: Hot deionised water rather than coffee or tea, and a single cup type. It shows the polyethylene lining degrades at drinking temperature; it does not quantify a dose from a real latte.

  2. 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 Contigo AUTOSEAL travel mug have microplastics?

Middle of the pack, and it is entirely about the lid. A sealing travel-mug lid is a small mechanism with several polymer parts, and unlike a water bottle it spends its life full of liquid at 70–85°C.

How was the Contigo AUTOSEAL travel mug score of 40 calculated?

Five components, added: packaging contact 12/30, use conditions 18/25, measured release 5/25, 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 Contigo AUTOSEAL travel mug 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.

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Stanley Classic vacuum bottle

Stainless steel interior with a plastic-lined stopper

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Grade C · 58%

69

Starbucks hot paper cup

Paperboard with a polyethylene inner lining and a polypropylene lid

Elevated

Grade B · 76%

31

Stanley Quencher tumbler

Stainless steel body with a polypropylene lid, gasket and straw

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Grade C · 60%

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