Calpak · Insulated Drinkware Tumblers
Insulated Tumbler 40oz
Lower concern. Stainless steel tumbler unlikely to contain PFAS.
Insulated tumblers made from stainless steel pose lower PFAS concern. Calpak makes no PFAS claims, but material composition suggests minimal risk.
Shop Calpak on Amazon →Material
Stainless steel with vacuum insulation
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
This tumbler uses food-grade stainless steel (typically 18/8 or 304-grade) as the inner and outer walls, with a vacuum-sealed airspace between them for insulation. Stainless steel is chemically inert and does not leach metals or off-gas compounds under normal use. The lid and gaskets are the only potential concern points, as they often contain silicone or plastic polymers that could theoretically degrade or leach if damaged, though this is uncommon in vacuum-insulated drinkware.
The brand's record and disclosure
Calpak is primarily known as a luggage and travel goods manufacturer; their expansion into drinkware is relatively recent and limited. No major safety recalls, certifications, or public disclosures specific to this tumbler line are documented. The brand has not published material sourcing or chemical safety statements for their tumbler products, reflecting a general lack of transparency typical of smaller home goods brands.
How it compares in its category
Insulated stainless steel tumblers are among the safest drinkware options available, with no inherent leaching risks from the core material. This product is materially equivalent to premium competitors like Hydro Flask, YETI, and Contigo in construction. Calpak's version is positioned as a budget alternative without independent third-party certifications (NSF, FDA material verification) that some competitors provide, though absence of certification does not indicate a safety problem.
If you buy it
Inspect the silicone lid gasket regularly for cracks or degradation; replace if compromised. Do not microwave the tumbler or expose it to extreme temperature swings, which can damage the vacuum seal. Wash by hand or in the top rack of a dishwasher to preserve the lid integrity. The tumbler itself will not degrade chemically with normal hot or cold beverage use, but the gasket may lose elasticity after 2-3 years of heavy daily use, warranting replacement of the lid assembly.
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.”
Lid/gasket material degradation
Silicone or rubber gaskets in the lid can crack, harden, or degrade with extended use or dishwasher exposure. No specific incidents reported for Calpak tumblers, but this is a common wear item across the category.
Vacuum seal failure and condensation
If the vacuum seal is compromised by damage or poor manufacturing, condensation can form in the wall cavity, though this poses no direct toxicological risk. Calpak does not disclose manufacturing QC standards.
Lead or heavy metals in stainless steel
Food-grade stainless steel (304/18-8) is not a source of lead or cadmium leaching. No testing or recalls suggest contamination in this product or brand.
BPA or bisphenol compounds in plastic components
The core is stainless steel; plastic is limited to the lid and gasket. Modern silicone gaskets do not contain BPA, and Calpak has not been flagged for BPA use in drinkware.
Coating or enamel degradation
This product relies on bare stainless steel, not enamel, ceramic, or polymeric coatings, eliminating this hazard class entirely.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 78% 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.