Clearly Filtered · Water Filters
32oz Stainless Bottle Cap and Straw
Stainless steel cap and straw with no coating on record.
The cap and straw are stainless steel with no surface coating or treatment on record. Stainless steel is not a material linked to PFAS. The brand has no PFAS statement on record for this product.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel cap and straw
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What 32oz Stainless Bottle Cap and Straw is made of, ingredients and materials
This product is a stainless steel cap and straw assembly, likely 18/8 or 18/10 food-grade stainless steel (chromium-nickel alloy). Stainless steel is chemically inert at normal use temperatures and does not leach harmful substances into water or beverages. Unlike coated metal caps or plastic straws, it has no polymer coating that can degrade, no enamel glaze that can chip, and no internal resin finish to off-gas. The material is inherently resistant to corrosion and microcracking from repeated washings.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Nickel leaching from stainless steel
Food-grade stainless steel (18/8) contains chromium and nickel. In acidic beverages or extended storage, trace nickel leaching is theoretically possible but far below FDA limits for food contact surfaces. No incident reports exist for this product.
Bacterial biofilm in straw interior
Metal straws are susceptible to biofilm buildup if not thoroughly dried or cleaned regularly, particularly in warm climates. This is a hygiene issue, not a material toxicity issue, but warrants attention during maintenance.
What’s reassuring
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
Microplastic or corrosion particle release
Stainless steel does not shed microplastics. Minor surface corrosion (white or rust spots) is cosmetic and not a health risk in food-grade alloys, though extremely rare in 18/8 stainless.
Rubber or seal degradation (if present)
This product is stainless cap and straw only. If seals or gaskets are silicone or rubber, manufacturer material specifications are not publicly disclosed; assess during inspection.
Coating or enamel flaking
Stainless steel hardware carries no coating in the traditional sense. Bare metal finish eliminates risk of lead or cadmium from ceramic glazes or enamel finishes.
The full breakdown
The brand's record and disclosure
Clearly Filtered markets itself as a water filtration brand focused on contaminant reduction (chlorine, sediment, taste). The company does not publicly disclose third-party testing results or material certifications (e.g., NSF, FDA approval statements) for this specific cap and straw assembly on widely available sources. No recalls, health complaints, or material controversies have been identified in public records for this component. The brand's silence on PFAS in their marketing materials is notable but not unusual for stainless steel hardware.
How it compares in its category
Stainless steel caps and straws are not materials linked to PFAS, alongside borosilicate glass lids. Most competitor bottles in this category use plastic caps (polypropylene or tritan) or combination metal-rubber seals, which introduce potential for BPA-free plastic off-gassing or rubber degradation over time. Stainless hardware outlasts plastic in lifespan and requires no replacement due to coating breakdown. This positions the Clearly Filtered cap and straw favorably in durability and chemical inertness.
If you buy it
Hand wash the stainless cap and straw with mild soap and warm water rather than dishwasher cycles if longevity is a priority; repeated high-heat cycles can eventually dull the finish but do not compromise safety. Inspect the threaded seal annually for minor corrosion, which is rare but can occur in very hard or chlorinated water over years of use. Replace only if cross-threading or leakage develops. Store dry between uses to prevent mineral buildup in the straw interior.
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
- Clearly Filtered has made none
Formulations change between production runs, so check the current label. How we grade.
More water filters 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.