Calpak · Insulated Drinkware Tumblers
CamelBak Horizon Tumbler
Lower concern tumbler, but brand makes no PFAS disclosure.
CamelBak Horizon uses stainless steel construction, a low-PFAS-risk material. No brand claims or testing data available on PFAS; plastic components not specified.
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Stainless steel with plastic lid and gasket
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
Category baseline
other is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
The Horizon Tumbler uses food-grade stainless steel (typically 18/8) as its primary liquid-contact surface, which is chemically inert and does not leach metals under normal use. The lid and gasket are plastic polymers (likely polypropylene or similar), which can off-gas volatile organic compounds and degrade when exposed to heat or prolonged hot liquids. Stainless steel tumblers are among the safer drinkware options because the steel itself poses no known leaching hazard, though the sealing components warrant attention.
The brand's record and disclosure
CamelBak (owned by Peloton/parent company Calpack Holdings) does not publish detailed material safety or PFAS disclosure statements on this product line. No major recalls or safety controversies are on public record for the Horizon Tumbler specifically. The brand's silence on chemical composition is typical of mid-market hydration brands but represents a missed opportunity for transparency that more premium competitors (like Hydro Flask) have begun adopting.
How it compares in its category
Insulated tumblers with stainless steel bodies are the safest category option; alternatives using vacuum-sealed glass or aluminum pose different trade-offs (glass breakage, aluminum leaching at low pH). The Horizon's plastic lid is standard across this price tier, though some competitors offer silicone or stainless alternatives that reduce off-gassing. Overall, this product sits in the middle-ground: safer than single-wall plastic bottles, comparable to similarly priced competitors like Contigo or S'well.
If you buy it
Hand-wash the lid and gasket in cool to warm (not hot) water to minimize plastic degradation and off-gassing into food contact surfaces. Do not leave hot beverages (above 160F/70C) in the tumbler for extended periods, as heat accelerates polymer breakdown. Replace the gasket or lid if visible cracks, discoloration, or persistent odors develop (typically after 18-24 months of heavy use). Avoid prolonged contact with acidic beverages (citrus, vinegar-based drinks), which can accelerate micro-corrosion at plastic-metal interfaces.
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.”
Plastic lid and gasket off-gassing
Polypropylene or similar polymers in the lid/gasket can release volatile organic compounds, especially when new or exposed to heat. This is a common but low-severity issue in insulated tumblers; airing out new lids before first use reduces impact.
Plastic thermal degradation
Repeated exposure to hot liquids (above 160F/70C) can cause the lid gasket to degrade, crack, or leach monomers. This typically occurs gradually after 12-24 months and is indicated by visible wear or odor changes.
Stainless steel corrosion at seams
Food-grade stainless steel in the Horizon does not leach metals under normal use. However, micro-gaps at the lid-to-steel interface can harbor bacteria if not cleaned thoroughly; regular hand-washing mitigates this entirely.
BPA/BPS in lid polymer
No public record indicates BPA or BPS in CamelBak lids, and most major brands have eliminated these since 2010. However, the brand does not formally certify its plastics as BPA-free, leaving a small information gap.
Gasket material allergens
Silicone or rubber gaskets can occasionally cause contact dermatitis or oral irritation in sensitive individuals, though this is rare. Polypropylene gaskets are less allergenic but may contain residual processing chemicals.
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 Insulated Drinkware Tumblers
Contigo
Byron 2.0 Stainless Steel Travel Mug Snapseal
Stainless steel, silicone gasket
Travel mug with lower PFAS concern; stainless steel typically safe.
✓Bare metal or glass, no coating at all
Thermos
Stainless King Travel Tumbler
Stainless steel exterior, vacuum-insulated, minimal internal coating
Lower concern. Stainless steel tumbler with standard design, no PFAS-prone features.
✓Bare metal or glass, no coating at all
Thermos
Stainless Steel Tumbler w/ Slide Lock Lid
Stainless steel tumbler with plastic slide lock lid
Lower concern. Stainless steel is PFAS-free; monitor lid material.
✓Bare metal or glass, no coating at all
More insulated drinkware 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.