Contigo · Portable Water Filtration
Contigo Clybourn Chill Stainless Steel FreeFlow Filter Water Bottle with AUTOSEAL
Stainless steel core suggests lower PFAS risk; filter material not disclosed.
Stainless steel construction and plastic components present lower inherent PFAS risk, but Contigo does not disclose filter coating or seal materials. No independent testing available.
The safe swap
CamelBak
CamelBak Eddy + filtered by LifeStrawr, 32oz Bottle, Vacuum Insulated Stainless Steel
100/100 safety
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Stainless steel body, plastic lid/filter housing
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Stain-resistant finish
Stain-resistant finishes are a common PFAS use.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
The Clybourn Chill uses a stainless steel 18/8 body, which is chemically inert and does not leach metals or off-gas into water under normal conditions. The lid, cap, and filter housing are plastic (material type not publicly disclosed by Contigo), which means they contact the water and could be a vector for leachables or degradation byproducts if made from certain polymers. The FreeFlow filter itself has no published composition details, making independent assessment of filter material safety impossible.
The brand's record and disclosure
Contigo does not publicly disclose material specifications for plastic components or filter composition, and has not made formal PFAS-reduction statements. The brand has no major product safety recalls related to water bottles in recent public records, but the lack of transparency on plastic sourcing and filter chemistry is notable for a filtered water product. Parent company Newell Brands has faced scrutiny on broader manufacturing practices but nothing specific to Contigo water bottles is widely documented.
How it compares in its category
Stainless steel water bottles are generally safer than plastic-bodied alternatives for leaching risk. However, filtered water bottles as a category carry inherent uncertainty: the filter material itself is often proprietary and rarely tested for contaminant leaching. Competing brands (e.g., LifeStraw, LARQ) often disclose filter media more transparently; Contigo's silence is a disadvantage in this space.
If you buy it
Replace the filter cartridge every 40 gallons (roughly 2 months of normal use) to prevent bacterial biofilm buildup in the filter housing. Do not microwave the lid or expose plastic components to boiling water, as this may accelerate polymer degradation. Clean the filter housing weekly with hot water and a brush, as damp plastic-enclosed spaces can harbor mold if left sealed for days. If the plastic develops cloudiness, cracks, or odor, discontinue use.
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.”
Filter housing and lid plastic composition (unknown polymer)
Contigo does not disclose whether the plastic is BPA-free, recycled content, or virgin material. Undisclosed plastics may leach when in prolonged contact with water or if exposed to temperature fluctuations, particularly if the polymer contains softening agents.
Filter media composition and leachability
The FreeFlow filter material is proprietary and not publicly characterized. Filters can shed microparticles or activate-carbon fines, and if the media binding uses resins, these could theoretically leach at trace levels, though no reports of this exist for this product.
Bacterial growth in filter cartridge if unmaintained
Any filtered water bottle is vulnerable to biofilm and bacterial colonization inside the filter housing if the cartridge is not replaced regularly or the housing is not dried between uses. This is a use-and-maintenance issue, not a manufacturing defect, but it is a real microbial safety concern.
Stainless steel body corrosion and gasket degradation
18/8 stainless steel is resistant to corrosion under normal use. Rubber or silicone gaskets around the cap may degrade over years of use, potentially allowing water leakage, but this is a functional rather than chemical hazard.
AUTOSEAL lid mechanism plastic wear
The AUTOSEAL valve is a moving plastic component that may wear or accumulate mineral deposits from repeated sealing. Worn seals could allow algae growth or bacterial infiltration; material composition of the valve seal is not disclosed.
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 Portable Water Filtration
CamelBak
Eddy + filtered by LifeStrawr, 32oz Bottle, Vacuum Insulated Stainless Steel
Vacuum insulated stainless steel body, activated carbon filter
Lower concern. Stainless steel and carbon filters typically PFAS-free.
✓Bare metal or glass, no coating at all
Aquamira
Water Storage Treatment 2 oz Glass Bottles 60 gallons Purification
glass bottles, sodium dichloroisocyanurate treatment chemical
Glass bottles present minimal PFAS risk.
✓Bare metal or glass, no coating at all
Waterdrop
Official ATP Tour All Purpose Thermo
Borosilicate glass, stainless steel, silicone gasket
Lower concern. Glass and steel water bottle, no known PFAS risks.
✓Naturally PFAS-free material
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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.