Yeti · Insulated Drink Tumblers
YETI 30 oz. Rambler Tumbler with MagSlider Lid
Lower concern. Bare stainless steel has minimal PFAS risk.
YETI Rambler tumblers are primarily stainless steel with no disclosed surface treatments that typically require PFAS. The MagSlider lid material is unspecified, introducing minor uncertainty.
The safe swap
Reduce
Reduce Halo Tumbler
100/100 safety
Same rubric that flunked this product. The swap earned its A.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Stainless steel tumbler, MagSlider lid material unspecified
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Stain-resistant finish
Stain-resistant finishes are a common PFAS use.
Category baseline
other is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
The Rambler tumbler body is 18/8 stainless steel (chromium-nickel alloy), which is highly resistant to corrosion and does not leach metals into beverages at normal use temperatures. The MagSlider lid material is not publicly disclosed by Yeti; industry standard for such lids is polypropylene (PP) or acetyl copolymer, both food-contact approved and stable in cold to warm (not boiling) conditions. The magnetic closure mechanism itself uses standard ferrite or neodymium magnets, which are not a leaching concern.
The brand's record and disclosure
Yeti does not publish detailed material safety disclosures, third-party certifications (BPA-free claims, etc.), or PFAS testing results on its website. The brand has not faced major product recalls related to chemical leaching or contamination. Yeti targets premium outdoor/lifestyle consumers but does not market transparent safety credentials the way some competitors (e.g., Hydro Flask) do.
How it compares in its category
Stainless steel tumblers are among the safest drinkware options because the material itself is chemically inert. Yeti's price point is higher than generic stainless options but similar to other premium brands; competitors like Hydro Flask and S'well also use 18/8 stainless with undisclosed polymer lids. The main differentiator is durability and brand reputation, not chemical safety.
If you buy it
Hand-wash the MagSlider lid in warm (not boiling) water to avoid degrading the polymer; do not microwave the lid or expose it to prolonged heat above 60°C. The stainless steel body is dishwasher-safe and will not degrade. Replace the lid if cracks, discoloration, or odor develop, as these signal polymer breakdown. For hot beverages above 65°C, wait for cooling or pre-warm the tumbler to avoid thermal stress to the lid seal.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Polymer lid degradation and leaching
The MagSlider lid material is not disclosed; if polypropylene, repeated heat exposure (dishwashers, hot beverages) may accelerate microcracking and release trace oligomers. Risk is low for cold/room-temperature use but increases with hot liquids.
Stainless steel nickel release
18/8 stainless steel is highly corrosion-resistant and does not leach nickel at normal pH and temperature. No reported incidents with Yeti products. Risk only arises if the steel is scratched and exposed to acidic beverages stored for weeks.
Magnetic component safety
Ferrite and neodymium magnets in the MagSlider do not leach or off-gas. No ingestion risk for adults using the tumbler as intended. Not a concern for this product category.
Lid seal wear and bacterial growth
If the magnetic seal degrades or the lid gasket (material unknown) hardens, liquid may seep and the lid interior may harbor bacteria if not dried promptly. Regular cleaning and prompt replacement of worn lids mitigate this risk.
Lack of third-party safety certification
Yeti does not publish BPA-free, phthalate-free, or heavy-metal testing certifications for this product. While stainless steel and standard food-grade polymers are generally safe, absence of independent verification is a disclosure gap compared to some competitors.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
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More insulated drink tumblers grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.