Yeti · Insulated Drink Tumblers & Travel Mugs
YETI Rambler Jr. 10 oz Tumbler with Straw Lid
Low-Medium risk. YETI discloses nothing about PFAS in lids.
The stainless steel body is PFAS-safe. Plastic lid and straw present modest risk, though consumer tumblers rarely require PFAS coatings.
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
stainless steel interior with plastic lid and straw
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.
BPA & bisphenols
YETI does not claim the lid or straw is BPA-free on product labels or website. The resin composition is undisclosed, leaving uncertainty whether polycarbonate or other BPA-containing plastics are used. Given the product's child-friendly size, absence of an explicit BPA-free statement is a gap.
Source: FDA ↗Phthalates
Softening agents (phthalates) are sometimes used in plastic lids and straws for flexibility. No public testing or certification by YETI rules this out. Risk is low if the product meets FDA food contact standards, but unconfirmed.
Source: ATSDR ↗PFAS
YETI's parent assessment grades PFAS at 65/100 (lower concern) but the company discloses nothing specific to the Rambler Jr. Some plastic beverage lids use PFAS-based non-stick or water-repellent coatings. Leaching risk under normal use is low, but lack of transparency limits confidence.
Source: ATSDR ↗Plastic degradation and microparticle release under thermal stress
Repeated exposure to hot water or dishwasher cycles can cause plastic lids and straws to degrade, potentially releasing microplastics into beverages. YETI does not publish thermal stability or durability data. Hand-washing in cool water mitigates this significantly.
What’s reassuring
Safe base material
Made from ceramic, mineral, or natural fiber with no PFAS risk.
Coating or adhesive leaching from lid seals
No recalls or documented cases of off-flavor, cloudiness, or chemical leaching from YETI Rambler lids have been reported. This is a passive observation based on absence of public safety data, not a guarantee.
The full breakdown
What it's made of and why it matters
The YETI Rambler Jr combines a food-grade stainless steel interior (18/8 or similar) with a plastic lid assembly and silicone or plastic straw. Stainless steel does not leach metals under normal use and is one of the safest beverage container materials. The plastic components (lid, straw) are the chemical exposure vector; YETI does not publicly specify the resin type (polypropylene, polycarbonate, acrylic, or other), making independent hazard assessment incomplete.
The brand's record and disclosure
YETI maintains minimal public transparency on material composition and chemical safety. The company has not published PFAS testing results, third-party certifications (e.g., NSF, BPA-free claims), or detailed material datasheets despite the Rambler line's premium positioning. No major recalls for chemical leaching or coating failure have been documented in this product line. The brand's silence on PFAS in particular is notable given industry-wide discussion of these compounds in beverage lids.
How it compares in its category
The stainless steel tumbler category is generally safer than ceramic (glaze lead risk) or coated aluminum (Teflon-type coating/coating degradation risk). Most competitors in YETI's price tier similarly withhold detailed PFAS and chemical disclosure. However, some brands (e.g., Hydro Flask, S'well) publish more explicit material specs and BPA-free certifications. The 10 oz size is a children's product, which heightens concern about undisclosed chemical content.
If you buy it
Hand-wash the lid and straw in cool to warm water only; dishwasher heat may accelerate plastic degradation or leaching. Avoid prolonged contact with hot liquids in the plastic components; use for cold or room-temperature beverages preferentially. Replace the lid or straw if visible cracking, cloudiness, or discoloration appears, as these indicate polymer breakdown. If using with a child, consider requesting the brand's material safety data or purchasing from retailers offering full returns if PFAS or BPA concerns arise.
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 none
Formulations change between production runs, so check the current label. How we grade.
Safer alternatives in Insulated Drink Tumblers & Travel Mugs
Yeti
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Nickel leaching from stainless steel
Limited concern
Low risk. Bare stainless steel tumbler with no known PFAS risk.
⚠Risky category by default
Contigo
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stainless steel body, silicone gasket/lid seal
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Limited concern
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⚠Risky category by default
Contigo
Cortland Chill 2.0 Stainless Steel Water Bottle
stainless steel, no reported coating
Gasket and seal degradation
Limited concern
Bacterial growth in inaccessible spaces
Limited concern
Thermal stress and seal failure
Limited concern
Low-Medium risk. Bare stainless steel bottle with no known problematic coatings.
⚠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.