Calpak · Insulated Drinkware Tumblers
Sample - 12 oz. Sherpa Vacuum Tumbler and Slim Can Insulator - Autumn Orange
Lower concern. Stainless steel and fleece are inherently PFAS-free materials.
This vacuum tumbler uses stainless steel and sherpa fleece, both materials without known PFAS risk. No treatment coating identified that would introduce PFAS chemicals.
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Stainless steel tumbler with sherpa fleece insulator
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, which does not leach metals under normal use conditions. The sherpa fleece insulator is polyester-based synthetic fabric bonded to the steel shell; polyester itself is chemically stable at room temperature and poses no leaching risk. The lid and any gaskets are typically silicone or plastic (material not specified in product details), which can be a minor concern only if exposed to sustained high heat above 160F. The tumbler is designed for cold and warm beverages, not boiling liquids, keeping thermal stress on materials minimal.
The brand's record and disclosure
Calpak is a California-based luggage and drinkware company with no publicly documented safety recalls or compliance violations related to this product line. The brand has not issued explicit PFAS-free certifications but does not appear in watchdog databases for chemical safety controversies. No third-party testing results for this specific tumbler are publicly available. The company's silence on chemical disclosures is typical for mid-market drinkware manufacturers, not a red flag.
How it compares in its category
Insulated tumblers with stainless steel construction and fabric sleeves are among the lowest-risk beverage containers on the market. This product sits in the mainstream segment alongside brands like Hydro Flask and simple store-brand options; all use similar stainless steel and polyester insulation strategies. The sherpa fleece is a comfort feature, not a safety liability, as polyester does not off-gas or migrate into beverages at normal temperatures. Compared to ceramic travel mugs (potential lead in glazes) or plastic-lined aluminum (BPA or coating risk), stainless + fleece is a safer choice.
If you buy it
Hand wash the tumbler and lid rather than subjecting them to dishwasher heat cycles over years, which can degrade any rubber gaskets. Do not fill with liquids above 160F to avoid stressing the fleece adhesive or any plastic components in the lid. Inspect the fleece annually for detachment or mold growth (moisture trapped inside); air dry completely after cleaning. Replace the tumbler if stainless steel shows dents that create crevices where bacteria could lodge, though this is a physical durability issue, not chemical.
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/gasket leachables (BPA, phthalates)
The product details do not specify the lid material; if it is polycarbonate or older polyester, thermal stress from hot beverages could release trace BPA or phthalates, though risk is low at recommended temperatures below 160F.
Fleece fabric dye or finish chemicals
Polyester fleece in this color (autumn orange) is typically dyed with acid dyes, which are not classified as toxic when properly fixed. No formaldehyde finishes or banned azo dyes are standard in commercial sherpa fleece production, and no recalls for Calpak textiles are on record.
Mold or bacterial growth in insulation
Moisture trapped between the stainless steel and fleece insulator can promote mold growth over months if the tumbler is not fully air-dried after washing. This is a hygiene and odor issue, not a chemical hazard, but mold exposure should be avoided.
Stainless steel leaching (nickel, chromium)
Food-grade stainless steel (18/8) does not leach nickel or chromium under normal beverage conditions (room temperature or warm drinks). Concern would only arise with prolonged contact with acidic liquids or boiling water, both outside normal use.
Adhesive off-gassing between fleece and steel
Industrial adhesives used to bond the fleece to the tumbler are typically solvent-free or low-VOC in modern drinkware production. No off-gassing risk is documented for this product category at room temperature.
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.