Calpak · Insulated Drinkware Tumblers
40oz Stainless Steel Tumbler
Lower PFAS concern. Bare stainless steel has no coating risk.
Stainless steel tumblers are inherently lower concern for PFAS, as the material contains no fluorochemical coatings. Calpak does not disclose PFAS information; uncoated stainless remains a safer choice.
Shop Calpak on Amazon →Material
Stainless steel, bare uncoated
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
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 is constructed from uncoated stainless steel, a chromium-iron alloy that resists corrosion without requiring protective coatings. Unlike ceramic tumblers with glazes or double-walled plastic alternatives, bare stainless steel has no polymer binders, enamels, or finish layers that can degrade and release contaminants. The material is inert across normal use temperatures (hot and cold beverages) and does not leach significant quantities of chromium or nickel under typical conditions, though minor surface interactions with acidic drinks over years remain theoretically possible but unmeasured for this specific brand.
The brand's record and disclosure
Calpak is known primarily for luggage and travel accessories; public disclosure on manufacturing standards, material testing, or chemical safety for this drinkware product is minimal to absent. No major recalls or safety controversies are on record for Calpak stainless steel tumblers. The brand's silence on PFAS and other hazard mitigation suggests a lack of third-party certification or transparent testing, though it does not indicate the presence of hazards.
How it compares in its category
Bare stainless steel tumblers are among the safest insulated drinkware options; they avoid coating-related risks (Teflon-type coating, lead, BPA) that plague some ceramic and plastic alternatives. Most competitors in the 40oz category (Hydro Flask, YETI, Contigo) use similar stainless steel construction with epoxy or powder-coat exterior finishes that may pose minor off-gassing or durability concerns. Calpak's uncoated approach is straightforward and low-risk, though it sacrifices color variety and aesthetic design options.
If you buy it
Hand wash with mild soap to avoid harsh dishwasher detergents that may pit the surface over extended use. Acidic beverages (lemon water, vinegar-based drinks) can cause minor corrosion over months if left sitting; rinse promptly. Replace only if dents compromise insulation or sealing capability, or if visible rust develops (rare but possible with poor care). Store dry and avoid abrasive scrubbing pads that damage the finish.
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.”
Nickel leaching (stainless steel alloy)
Stainless steel contains nickel as an alloying element; migration into beverages is minimal in neutral-pH drinks but slightly elevated in acidic or salt-heavy liquids. No brand-specific testing available for Calpak tumbler; industry standard 304/316 grades rarely exceed safe limits under normal use.
Lid gasket and seal degradation
If the tumbler includes silicone or rubber gaskets (common in insulated tumblers), these may contain BPA or phthalates depending on supplier. No information on Calpak's gasket sourcing is publicly available; inspect for off-odors or cloudiness indicative of degradation.
Bacterial or mold growth in insulation gap
Double-walled stainless steel construction can trap moisture in the insulation cavity if not properly sealed or if capillary action allows liquid to enter. This is a practical maintenance issue rather than chemical hazard but can result in internal corrosion or odor over years if the seal fails.
Coating or adhesive residue (interior sealing)
Bare stainless steel eliminates exterior coating risk, but if the interior features any epoxy or food-grade sealant (rare), off-gassing is possible. Calpak's product documentation does not specify interior treatment; assume bare metal unless marked otherwise.
Surface contamination or manufacturing residue
Uncoated stainless steel tumblers may retain processing oils, metal dust, or cleaning agent residue from manufacturing. No recalls or contamination reports exist for Calpak; standard practice is a hot-water rinse before first use as a precaution.
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.
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.