Yeti · Insulated Drink Tumblers & Travel Mugs
YETI Rambler 26 oz Bottle Straw Cap
Lower concern. Stainless steel and hard plastics pose minimal PFAS risk.
YETI does not disclose PFAS use in this product. Stainless steel bottles and rigid plastic caps typically avoid PFAS, though some plastic components occasionally contain fluorinated coatings. No public lab testing available.
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Material
Stainless steel bottle, plastic straw cap
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
Category baseline
cookware is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
The Rambler 26 oz bottle is constructed from 18/8 stainless steel, a food-grade alloy that resists corrosion and does not leach metals into beverages under normal use. The straw cap is injection-molded plastic (likely polypropylene or co-polymer), designed to remain below liquid level and not contact hot contents directly. Stainless steel is chemically inert at typical beverage temperatures; the plastic cap's risk profile depends on whether it contacts hot liquids and how often it is replaced.
The brand's record and disclosure
Yeti does not publicly disclose material sourcing, manufacturing certifications (FDA, NSF), or testing protocols for heavy metals or leachates. The brand markets durability and insulation performance but has not issued statements addressing PFAS, phthalates, or chemical safety specifically. No voluntary recalls related to chemical contamination have been issued for Rambler bottles. Third-party safety certifications for this product line are not widely documented in public sources.
How it compares in its category
Stainless steel drinkware (Yeti, Hydro Flask, Klean Kanteen) is considered safer than plastic-only bottles for chemical leaching because the interior surface does not degrade or shed microplastics. However, many competitors (Hydro Flask, S'well) similarly lack transparent PFAS or heavy metal testing data. Yeti's plastic cap design is typical for the category but is a minor concern point because caps are replaced less frequently than the bottle itself and do not contact most beverages.
If you buy it
Do not fill with liquids hotter than 140°F (60°C) if the plastic cap is submerged, as elevated temperature can increase plastic leaching risk. Replace the cap every 1-2 years or if discoloration, cracking, or odor develops. Hand-wash both bottle and cap in warm soapy water; avoid prolonged dishwasher cycles that stress plastic. Store in a cool, dry location away from direct sunlight to prevent material fatigue.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Plastic cap degradation and microplastic shedding
Repeated thermal cycling and contact with acidic or hot beverages may cause the polypropylene cap to micro-crack or degrade over time. The risk is low for room-temperature or chilled use but increases if hot liquids contact the cap seal directly.
Heavy metal leaching from stainless steel
18/8 stainless steel (Yeti's stated material) is resistant to corrosion and leaching at pH ranges typical of drinking water and beverages. No published recalls or contamination incidents for Yeti Ramblers have been reported; the risk is inherently low for this alloy grade.
Plastic cap material identity and phthalate risk
Yeti does not publicly disclose the exact plastic resin or additives in the cap. Most food-contact caps use polypropylene (low phthalate risk), but confirmation is unavailable. Consumer contact with the cap during drinking is minimal, reducing exposure potential.
Coating or lining degradation
The interior of stainless steel drinkware is typically bare metal with no applied coating, so there is no glaze, enamel, or epoxy lining to chip or degrade. This design avoids ceramic or polymer coating risks common in other cookware categories.
Bacterial growth in cap or seals
The straw cap design includes crevices and rubber or silicone seals that can harbor bacteria if not cleaned thoroughly after each use. This is a hygiene concern rather than a chemical hazard but merits attention in daily maintenance.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Insulated Drink Tumblers & Travel Mugs
Yeti
Rambler Tumbler YETI
18/8 stainless steel, no coating
Lower concern. Bare stainless steel tumbler, no known PFAS risk.
⚠Risky category by default
Contigo
Autoseal West Loop Stainless Steel Travel Mug
stainless steel body, silicone gasket/lid seal
Lower concern. Stainless steel and silicone have minimal PFAS risk.
⚠Risky category by default
Contigo
Cortland Chill 2.0 Stainless Steel Water Bottle
stainless steel, no reported coating
Lower PFAS concern. Bare stainless steel bottle, 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.