Yeti · Insulated Drink Tumblers
Rambler Bottle Chug Cap YETI
Low risk; base materials unlikely to hold PFAS.
YETI Rambler bottles use stainless steel and silicone, materials inherently unlikely to contain PFAS. The brand hasn't disclosed PFAS policy; no third-party testing was found.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel and silicone construction
Lab data
No public lab test
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What Rambler Bottle Chug Cap YETI is made of, ingredients and materials
The Rambler Bottle Chug Cap uses food-grade stainless steel (typically 18/8) for the bottle body and silicone for the cap seal and spout components. Stainless steel is chemically inert and does not leach metals under normal use conditions, with lower concern for leaching compared to some other materials. Silicone is a synthetic polymer with minimal leaching risk in contact with water or cold beverages, though prolonged exposure to very hot liquids or certain solvents can theoretically cause minor degradation.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
Silicone seal degradation with age
Silicone can gradually lose elasticity and may develop odor or discoloration after 12-24 months of regular use; replacement caps are widely available and inexpensive.
Bacterial growth in cap mechanism
The chug cap's valve design may trap moisture and food particles if not disassembled and cleaned thoroughly after each use, creating conditions for mold or bacterial biofilm.
Microplastics
Over many years of use, silicone seals may shed microscopic particles if degraded or repeatedly flexed; risk is low with proper care and regular replacement of worn caps.
Source, EPA ↗What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Stainless steel corrosion with acidic contents
18/8 stainless steel is highly corrosion-resistant; acidic beverages (lemon water, sports drinks) pose minimal risk under normal use, though prolonged storage over weeks may cause minor surface etching.
Heavy metals
Food-grade stainless steel does not leach nickel or other metals into water or beverages under normal temperature and pH conditions; material chemistry indicates lower concern for this hazard.
Source, FDA ↗How is this PFAS grade calculated?
The brand's record and disclosure
Yeti does not publicly disclose detailed material safety testing, certifications, or supply chain transparency reports specific to this product. The brand maintains no published PFAS policy or stance, though stainless steel and silicone as base materials are not typical PFAS sources. No consumer safety recalls, contamination incidents, or lawsuits regarding this bottle model are documented in public records, suggesting a clean track record to date.
How it compares in its category
Among reusable water bottles, stainless steel construction has lower leaching concerns than plastic alternatives like polycarbonate or polypropylene, similar to glass. The silicone cap is more durable than cheaper rubber or vinyl seals that may contain plasticizers. Premium brands like Yeti typically use higher-grade stainless steel and food-safe silicone than budget competitors, reducing risk of corrosion or off-gassing over the product lifetime.
If you buy it
Hand wash the cap and seals regularly to prevent bacterial biofilm buildup in crevices, particularly around the spout valve. Prolonged storage of acidic beverages (citrus, vinegar) can degrade silicone seals over months, while short-term use shows lower concern for this degradation. Do not microwave the cap or expose silicone parts to sustained temperatures above 200F, as this can accelerate material degradation. Replace the silicone cap seal every 1-2 years if you notice discoloration, odor, or reduced elasticity.
What is not known about PFAS in this product?
- 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.
What are the PFAS-free alternatives to Rambler Bottle Chug Cap YETI?
- Stainless steel bottle, stainless steel cap
- The brand calls it PFAS-free, which we have not verified
- Powder-coat cap degradation over time
3 hazards checked on this product, all on its full breakdown.
- Stainless steel body, powder-coat finish
- The brand calls it PFAS-free, which we have not verified
- Powder-coat finish degradation
3 hazards checked on this product, all on its full breakdown.
- Stainless steel bottle, plastic cap and silicone gasket
- The brand calls it PFAS-free, which we have not verified
- Silicone gasket degradation and leaching
3 hazards checked on this product, all on its full breakdown.
More insulated drink tumblers 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.