Yeti · Insulated Drink Tumblers & Travel Mugs
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 safe swap
Yeti
Rambler Tumbler YETI
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
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Category baseline
PFAS exposure happens more often with clothing products.
No PFAS disclosure
The company has not publicly discussed 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
Safe base material
Made from ceramic, mineral, or natural fiber with no PFAS risk.
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.
The full breakdown
What it's made of and why it matters
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.
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 is among the safest options in the cookware category, avoiding hazards associated with 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 and safe 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 we don’t know
- Basis
- Model estimate, 78% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Yeti has made none
Formulations change between production runs, so check the current label. How we grade.
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Yeti
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Nickel leaching from stainless steel
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⚠Risky category by default
More insulated drink tumblers & 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.