Rambler 24 oz Mug with Ceramic Lining
Lower PFAS concern; ceramic lining is not associated with PFAS.
Ceramic-lined drinkware poses lower PFAS risk than nonstick coatings. YETI makes no PFAS claims; ceramic interior is an established safer material choice.
We flunk more products than we pass. This one earned its grade. How we grade
Material
stainless steel exterior, ceramic lining interior
Lab data
No public lab test
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What Rambler 24 oz Mug with Ceramic Lining is made of, ingredients and materials
The Rambler 24 oz uses 18/8 stainless steel for the outer wall and a ceramic interior coating over the steel body. Ceramic linings are inert, non-leaching materials that do not release heavy metals, BPA, or phthalates into beverages under normal use. Stainless steel itself does not leach at room temperature or in contact with neutral or acidic foods and drinks.
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.
Ceramic coating degradation over time
Ceramic linings can chip or develop hairline cracks with use and thermal stress. Once the underlying stainless steel is exposed in a small area, acidic beverages may cause surface oxidation or discoloration; large breaches increase contact with the bare metal substrate.
Bacterial growth in crevices or damaged coating
Cracks in the ceramic lining can harbor bacteria if not dried thoroughly or if the mug sits with liquid for extended periods. This is a maintenance risk, not a material hazard, and is managed by regular washing and air-drying.
Thermal shock or fracture
Rapid temperature swings (boiling water to ice water) can stress ceramic linings and cause cracking. This is a durability and safety issue if sharp ceramic fragments enter the beverage; it is not a chemical hazard.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Metal leaching (stainless steel)
18/8 stainless steel does not leach nickel, chromium, or iron into neutral or slightly acidic beverages under normal room-temperature storage. Leaching risk is negligible and not on record for this alloy in drinkware use.
Heavy metals
No lead or cadmium contamination has been reported in YETI ceramic-lined drinkware. The brand does not disclose glaze composition or third-party testing results, so this assessment is based on absence of recalls or public complaints, not laboratory confirmation.
Source, FDA ↗The full breakdown
The brand's record and disclosure
YETI does not publish detailed materials disclosure or third-party safety certifications for this product on public channels. The brand has not faced recalled drinkware due to coating or material hazards on record. Absence of disclosure is typical in the premium drinkware category and does not indicate a hazard, but limits independent verification of ceramic coating formulation or testing.
How it compares in its category
Ceramic-lined stainless steel mugs are among the lower-hazard options for reusable drinkware, avoiding polymer linings (which may contain BPA or phthalates) and non-stick coatings (which may degrade). This design is comparable to other ceramic-lined insulated mugs from competitors like Hydro Flask and S'well. The trade-off is that ceramic coatings can chip or crack over time, exposing bare steel underneath.
If you buy it
Inspect the ceramic lining before use and regularly for chips or cracks; if exposed steel is visible, discontinue use with acidic beverages (citrus, vinegar, wine) to prevent leaching. Hand wash or use gentle dishwasher cycles to preserve the coating. Avoid sudden temperature changes (very hot liquid followed by ice water) which can cause thermal shock and cracking. Replace if the ceramic coating develops large cracks or if bare metal is exposed in the contact zone.
What we don’t know
- 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.
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.