YETI Rambler Stackable Cup with MagSlider Lid
Low-Medium risk. Stainless steel cup has no known PFAS risks.
YETI Rambler is stainless steel with elastomer components, materials not linked to PFAS use. No PFAS disclosure is offered, but design poses minimal risk.
The better-graded swap
Owala
Owala Stainless Steel Straw Tumbler Route 66
80/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Stainless steel body, elastomer lid seal
Lab data
No public lab test
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What YETI Rambler Stackable Cup MagSlider Lid is made of, ingredients and materials
The YETI Rambler uses 18/8 food-grade stainless steel (18% chromium, 8% nickel) for the cup body, which is chemically inert and does not leach into beverages under normal use. The lid features elastomer seals (likely silicone or comparable polymer) rather than enamel or ceramic coatings, eliminating risks from glaze degradation, lead, or cadmium contamination. Stainless steel's passivated surface resists corrosion and maintains integrity over years of use without coating breakdown.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Elastomer lid degradation
Silicone and elastomer seals can degrade or leach trace compounds over years of thermal cycling and contact with hot beverages, though at very low levels. No specific failures documented for YETI Rambler lids in published safety databases.
Microplastic or polymer fragments
The elastomer seal could theoretically shed microscopic fragments under repeated thermal stress or aggressive cleaning, though no peer-reviewed studies document this for YETI-brand lids specifically. Risk is low under normal handling.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Nickel leaching from stainless steel
Food-grade 18/8 stainless steel releases negligible nickel into neutral or slightly acidic beverages (water, coffee, tea). Only prolonged contact with strong acids or alkalies would pose theoretical risk, which does not apply to typical drink use.
Lead
The Rambler cup body is bare stainless steel with no ceramic glaze, enamel, or decorative coating, eliminating this hazard class entirely.
Source, ATSDR ↗Teflon-type coating (Teflon) fume risk
Stainless steel construction does not use Teflon-type coating non-stick coatings, so heating poses no Teflon-family coating fume risk.
How is this PFAS grade calculated?
The brand's record and disclosure
YETI does not publicly disclose detailed material sourcing or third-party testing results for this specific product, though the brand has built reputation on durability claims and has not faced established recalls for leaching or coating failure in drinkware. The company markets the Rambler as food-safe and suitable for hot/cold beverages without material-specific warnings. No credible reports of health incidents linked to YETI Rambler composition have been published in consumer safety databases.
How it compares in its category
Stainless steel drinkware avoids many hazards present in ceramic-lined, enamel-coated, or aluminum alternatives (which risk lead leaching, coating degradation, or aluminum exposure). The Rambler's elastomer lid presents lower concern than plastic lids that may contain BPA or phthalates, though the lid itself is not independently certified. In the premium insulated cup market, YETI's stainless steel approach is industry standard and poses lower chemical risk than lower-cost alternatives using unknown coatings or mixed materials.
If you buy it
Wash the cup by hand or in dishwasher; stainless steel tolerates both. Inspect the elastomer seal annually for signs of cracking or discoloration; replace the lid if visible damage occurs (typically after 2-3 years of heavy use). Do not leave hot beverages in the cup indefinitely, as prolonged heat can stress the seal, though brief hot liquid use poses no material risk. Avoid abrasive scrubbers that may scratch the interior, as this can expose the base metal (though stainless steel resists meaningful corrosion even if scratched).
What is not known about PFAS in this product?
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Yeti has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to YETI Rambler Stackable Cup with MagSlider Lid?
- stainless steel exterior, ceramic lining interior
- Ceramic coating degradation over time
3 hazards checked on this product, all on its full breakdown.
- Stainless steel body, plastic lid
- We found no PFAS statement from the brand
- Plastic lid polymer identity and leaching potential
3 hazards checked on this product, all on its full breakdown.
- Stainless steel body, no interior coating disclosed
- Silicone and plastic lid/valve leachables
3 hazards checked on this product, all on its full breakdown.
More insulated travel mugs 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.