Does Yeti Rambler have microplastics?
The short answer
The steel body contributes nothing, as with every steel tumbler. The score is the lid — and the Rambler's standard MagSlider is a simpler assembly than most, with a magnetic slide rather than a straw sitting permanently in the drink.
Plastic lid or cap format profile
Why Yeti Rambler scores 30
Steel interior — the body is inert to heat, acid and abrasion alike
A polypropylene lid with a sliding magnetic closure directly above the contents
Frequently used for hot coffee, which puts the lid in the vapour path
No straw on the standard lid, which is the single biggest difference from a straw tumbler
Where the 30 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
- 8 / 30
- Use conditions
- 13 / 25
- Measured release
- 4 / 25
- Polymer behaviour
- 5 / 10
- Processing
- 0 / 10
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.
Heat, abrasion, flexing, repeated opening, reuse beyond design life. The same bottle scores differently in a fridge and in a hot car.
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.
How this specific polymer behaves — brittleness, fat solubility of its additives, thermal stability, whether it is a polymer named in existing restrictions.
What happened before you bought it. Retort sterilisation inside the pack, hot-filling, and pressurised brewing all happen at the most migration-favourable moment.
What we don't know
No tumbler lid of any brand has been measured. The ranking between lid designs here rests on how many polymer surfaces there are and how much they move, which is reasoning rather than a result. Treat small gaps between grade C drinkware as noise.
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 with one simple stopper
Glass bottle with a steel cap
the lowest-scoring reusable we list
Drink from the rim, not a straw lid
free, and it is most of the difference
Check the one in your hand
This page scores Yeti Rambler 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 & drinkwareSources 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-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.
- 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.
Frequently Asked Questions
Does Yeti Rambler have microplastics?
How was the Yeti Rambler score of 30 calculated?
Is Yeti Rambler safe?
Why is the confidence only 58%?
Scored next to this
Stanley Quencher tumbler
Stainless steel body with a polypropylene lid, gasket and straw
Grade C · 60%
Hydro Flask Wide Mouth
Stainless steel body with a polypropylene flex cap
Grade C · 58%
Owala FreeSip
Stainless steel body with a multi-part polypropylene and silicone lid
Grade C · 58%
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