YETI Rambler Stackable Cup 20 oz. Rescue Red
Low-Medium risk. Stainless steel drinkware rarely contains PFAS.
This cup is 18/8 stainless steel with no reported PFAS issues or treatments. Standard stainless steel construction presents lower concern.
The better-graded swap
Thermos
Thermos 18 oz. Icon Vacuum Insulated Stainless Steel Mug
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
18/8 stainless steel interior and exterior
Lab data
No public lab test
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What YETI Rambler Stackable Cup oz. Rescue Red is made of, ingredients and materials
The Rambler uses 18/8 stainless steel (18% chromium, 8% nickel) for both interior and exterior surfaces, a food-grade alloy that resists corrosion and does not degrade into drinking water under normal use. Stainless steel is inert at typical beverage temperatures and does not release harmful metals or chemicals when in contact with water, coffee, or other common drinks. The cup's construction avoids ceramic glazes, plastic liners, and non-stick coatings, which are common sources of lead, cadmium, BPA, or Teflon-type coating fumes in other drinkware.
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.
Nickel sensitivity from stainless steel contact
Individuals with severe nickel allergies may experience contact dermatitis from prolonged exposure to the cup's exterior or lip. This is a known but rare concern with stainless steel drinkware; most users tolerate it without issue.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Lead
Stainless steel construction has no glazes, enamels, or ceramic coatings where lead or cadmium accumulate. No recalls or testing data suggest contamination in this product.
Source, ATSDR ↗Aluminum leaching
This product is stainless steel, not aluminum. Aluminum-based drinkware poses oxidative leaching risks; this design eliminates that hazard entirely.
Teflon-type coating fume risk from non-stick coatings
Yeti Rambler uses no non-stick coating. Stainless steel interior eliminates Teflon-type coating degradation or off-gassing at any temperature encountered in normal drinking use.
Coating degradation over time
18/8 stainless steel does not degrade, peel, or flake with normal use. The material is stable indefinitely unless severe mechanical damage occurs.
How is this PFAS grade calculated?
The brand's record and disclosure
Yeti does not publicly disclose detailed material safety certifications or third-party testing results for their drinkware on their website or product documentation. The company has not faced documented recalls or safety investigations related to this product line. Yeti's silence on PFAS use and heavy metal testing is typical for the stainless steel drinkware industry but leaves verification of supplier standards opaque to consumers.
How it compares in its category
Stainless steel drinkware has lower concern compared to ceramic glazes (lead/cadmium), aluminum (oxidative leaching), and non-stick coatings (Teflon-type coating breakdown). Yeti's stackable cup design is comparable to other premium stainless steel brands like Hydro Flask and S'well in material safety, though none provide detailed independent testing. The main trade-off versus cheaper plastic alternatives is cost, not safety profile.
If you buy it
Stainless steel is durable for hot and cold beverages with no special care required beyond normal washing. Avoid harsh scouring that may scratch the exterior finish, though minor scratches do not compromise food safety. The cup will not degrade or leach over years of use. Replace it only if dents occur or the insulation performance declines, not for safety reasons related to material degradation.
What is not known about PFAS in this product?
- Basis
- Model estimate, 78% 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 20 oz. Rescue Red?
- stainless steel exterior, ceramic lining interior
- Ceramic coating degradation over time
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- 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.