Contigo · Insulated Travel Mugs
Contigo Autoseal West Loop Stainless Steel Travel Mug
Low-Medium risk. Stainless steel and silicone have minimal PFAS risk.
This travel mug features stainless steel construction with silicone seals and gaskets. No PFAS-containing treatments have been reported for this model.
We flunk more products than we pass. This one earned its grade. How we grade
Material
stainless steel body, silicone gasket/lid seal
Lab data
No public lab test
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What Contigo Autoseal West Steel Travel Mug is made of, ingredients and materials
The Contigo Autoseal West Loop uses a 18/8 stainless steel body, which is food-grade and resistant to corrosion and leaching under normal use. The lid and gasket are silicone-based, which does not readily leach into beverages at typical drinking temperatures. Stainless steel is one of the lowest-risk material choices for drink containers because it does not degrade or transfer metal ions into liquids the way aluminum or uncoated steel can.
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.
Silicone gasket degradation and bacterial/mold colonization
Silicone seals in insulated mugs can accumulate moisture and bacteria if not dried thoroughly or replaced regularly. This is a maintenance issue rather than a design defect and is common to all insulated mug designs.
What’s reassuring
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
Stainless steel leaching (nickel or chromium)
High-grade 18/8 stainless steel is resistant to corrosion in neutral pH beverages (water, coffee, tea). No documented cases of nickel or chromium leaching from Contigo Autoseal products into drinking liquids under normal conditions.
Lid/gasket material off-gassing or migration
Silicone used in food-contact seals is stable at room and warm drink temperatures. No recalls or complaints document odor transfer or chemical migration from the Autoseal lid into beverages.
Heavy metals
Contigo Autoseal West Loop uses exterior paint or powder coat finishes typical of the category. No recalls or testing data suggest lead or cadmium contamination; exterior coatings do not contact beverages.
Source, FDA ↗BPA & bisphenols
Contigo markets the Autoseal West Loop as BPA-free. Silicone gaskets do not contain bisphenols. No independent testing is available, but the brand's claim aligns with industry standard for this price tier.
Source, FDA ↗How is this PFAS grade calculated?
The brand's record and disclosure
Contigo has no documented history of recalls or safety violations related to the Autoseal West Loop line. The company does not publicly disclose detailed chemical safety testing or third-party certifications (e.g., BPA-free validation from independent labs), but makes basic non-BPA claims on product packaging. The brand operates transparently on manufacturing compliance but does not engage in independent transparency initiatives like the Cradle to Cradle or similar programs.
How it compares in its category
Stainless steel travel mugs are linked to lower concern compared to some other drink container materials, similar to glass and ceramics. Most competitors (Hydro Flask, YETI, Klean Kanteen) use identical 18/8 stainless construction and silicone or rubber gaskets, making chemical risk profiles largely equivalent. Contigo's price point is competitive and lower than premium brands, without known quality or durability compromises on the insulation or seal integrity.
If you buy it
Hand wash the silicone gasket weekly and inspect for cracks, discoloration, or odor buildup, which can signal bacterial or mold growth in the seal cavity. Do not expose to temperatures above 160 degrees Fahrenheit (boiling water is acceptable for brief contact). Replace the gasket every 1-2 years or sooner if it becomes visibly degraded; Contigo sells replacement seals affordably. Dry thoroughly after washing, especially the interior seams, to prevent mold colonization in the insulating air gap.
What is not known about PFAS in this product?
- Basis
- Model estimate, 78% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Contigo 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 Contigo Autoseal West Loop Stainless Steel Travel Mug?
- stainless steel exterior, ceramic lining interior
- Ceramic coating degradation over time
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- Stainless steel body, plastic lid
- We found no PFAS statement from the brand
- Plastic lid polymer identity and leaching potential
3 hazards checked on this product, all on its full breakdown.
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.