20oz Double Wall Tumbler With Vacuum Sealer
No coating described, and no PFAS statement from the brand.
The product information we reviewed describes double-wall stainless steel, with no water-repellent coating named. Water resistance on products like this usually comes from the material and its seals rather than a surface treatment. The brand has published no PFAS statement for it.
The better-graded swap
Klean Kanteen
Klean Kanteen Insulated TKWide Cap
95/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Double-wall stainless steel
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What 20oz Double Wall Tumbler Vacuum Sealer is made of, ingredients and materials
This tumbler uses double-wall stainless steel (typically 18/8 or 18/10 grade) with a vacuum seal between layers, which is a non-coated, non-reactive material. Stainless steel does not leach significant metals into beverages under normal use because the chromium oxide layer on its surface is stable and resistant to corrosion. Unlike ceramic or painted metal tumblers, there is no glaze, enamel, or polymeric coating to degrade over time or release particles into drinks.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Lid and seal material degradation
The lid typically contains plastic (often polypropylene) and rubber gaskets; these can degrade if repeatedly exposed to boiling water or dishwasher heat cycles. Material composition of the lid is not specified in standard product descriptions, so degradation risk is context-dependent.
Vacuum seal failure over time
The vacuum seal between walls is not user-serviceable and may gradually weaken with age or thermal stress, though this affects insulation performance rather than safety. No toxicity risk is associated with seal failure itself.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Stainless steel corrosion and leaching
Double-wall stainless steel (18/8 or 18/10) is highly corrosion-resistant and does not leach chromium, nickel, or iron into acidic or neutral beverages under normal use. No documented cases of leaching from this material class in tumblers.
Microplastics
Stainless steel does not shed microplastics. Plastic lid components could theoretically contribute microplastics if degraded, but this is not a documented risk in this product category under normal use.
Source, EPA ↗Heavy metals
Product description indicates stainless steel construction; no paint, coating, or exterior finish is described. If paint is applied to the exterior, no hazard testing results or brand certifications are publicly available, so this cannot be assessed.
Source, FDA ↗How is this PFAS grade calculated?
The brand's record and disclosure
The brand is primarily known for luggage and travel accessories; limited public disclosure history on materials testing or PFAS stance for drinkware specifically. No major recalls or safety controversies are on record for this product line. The brand does not appear to have published independent third-party certifications (e.g., NSF, FDA material compliance) for this tumbler, which is typical for budget-oriented consumer brands in this category.
How it compares in its category
Double-wall stainless steel tumblers have lower concern for coating-related hazards that affect some ceramic-lined or powder-coated alternatives. This design is standard across price points and performs similarly to mid-range competitors; vacuum-seal construction is durable and maintenance-free. The main variable among competitors is lid material and seal type, not the tumbler body itself.
If you buy it
Rinse the interior before first use to remove any manufacturing dust or residue. Stainless steel is dishwasher-safe, though hand-washing the lid components (often plastic or rubber) may extend their lifespan. Do not expose to extreme temperature shocks (e.g., boiling water directly into a cold tumbler) as this can eventually weaken the vacuum seal. Check the lid gasket annually for cracks or degradation; replace if compromised to maintain insulation and prevent leaks.
What is not known about PFAS in this product?
- Basis
- Model estimate, 35% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to 20oz Double Wall Tumbler With Vacuum Sealer?
- Stainless steel bottle, stainless steel cap
- The brand calls it PFAS-free, which we have not verified
- Powder-coat cap degradation over time
3 hazards checked on this product, all on its full breakdown.
- Stainless steel body, powder-coat finish
- The brand calls it PFAS-free, which we have not verified
- Powder-coat finish degradation
3 hazards checked on this product, all on its full breakdown.
- Stainless steel bottle, plastic cap and silicone gasket
- The brand calls it PFAS-free, which we have not verified
- Silicone gasket degradation and leaching
3 hazards checked on this product, all on its full breakdown.
More insulated drink 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.