Klean Kanteen · Portable Water Bottles
Klean Kanteen 27oz Wide Water Bottle with Loop Cap
Brand PFAS statement on record, which we have not verified.
Klean Kanteen describes its bottles as BPA, PFAS and lead-free. We record that as an unverified brand claim.
Brand says: “Klean Kanteen describes its bottles as BPA, PFAS and lead-free.”
We flunk more products than we pass. This one earned its grade. How we grade
Material
18/8 stainless steel, no interior coating
Brand disclosure
Brand claims PFAS-free
Lab data
No public lab test
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What Klean Kanteen 27oz Wide Water Loop Cap is made of, ingredients and materials
This bottle is constructed from 18/8 stainless steel, a chromium-nickel alloy that does not require interior coatings or liners. The absence of a coating eliminates risks from epoxy resins, phenolic compounds, or polymer degradation that plague coated alternatives. Stainless steel is chemically stable across temperature ranges typical for water storage and does not leach metals into cold or room-temperature liquids under normal use.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
Cap or closure contamination
The Loop Cap material composition is not specified in available context. If the cap is plastic, it may carry low-level BPA or phthalate risk depending on polymer type; verification of the cap material is recommended before purchase.
Bacterial or mold growth from moisture retention
Any reusable water bottle can harbor bacteria if not dried thoroughly between uses. This is a user-maintenance issue rather than a product defect, but improper cleaning increases microbial risk.
What’s reassuring
Brand-stated PFAS-free
The brand states this product is PFAS-free. We have not verified the claim.
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
Metal leaching from stainless steel
18/8 stainless steel does not leach nickel or chromium into water under normal conditions (neutral pH, room temperature). This hazard is not documented for this material in the portable bottle category.
Coating degradation or flaking
No interior coating is present on this model. This eliminates the risk of epoxy, phenolic, or polymer coating failure common in coated stainless bottles.
How is this PFAS grade calculated?
The brand's record and disclosure
Klean Kanteen has made a public PFAS-free claim and markets itself as focused on non-toxic materials. The brand has not faced major product recalls or safety violations on record for this product line. Independent verification of their PFAS claims has not been published by us, so the claim rests on the brand's own statement and material sourcing transparency.
How it compares in its category
Uncoated stainless steel bottles have lower concern for coating-related hazards compared to coated alternatives. Most plastic alternatives carry BPA, BPS, or phthalate risks; many insulated stainless bottles use polymer liners or coatings that can degrade. Klean Kanteen's simple, unlined design avoids these trade-offs.
If you buy it
Rinse before first use and dry completely after each fill to prevent mineral buildup or stale water. Stainless steel is durable and does not require replacement due to coating wear. Avoid prolonged contact with harsh acids or salt-based solutions in storage, though normal water use poses no concern. The Loop Cap should be checked periodically to ensure seals remain intact.
What is not known about PFAS in this product?
- Basis
- Model estimate, 92% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Klean Kanteen has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
More portable water bottles 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.