40oz Stainless Steel Tumbler
Stainless steel tumbler with no coating on record.
This tumbler is recorded as bare, uncoated stainless steel with no surface treatment. The brand has no PFAS statement on record for this product.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel, bare uncoated
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What 40oz Stainless Steel Tumbler is made of, ingredients and materials
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.
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.
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 tumbler; industry standard 304/316 grades show lower concern for leaching 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 the brand'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.
What’s reassuring
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
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. The brand'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 the brand; standard practice is a hot-water rinse before first use as a precaution.
How is this PFAS grade calculated?
The brand's record and disclosure
The brand 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 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 present lower concern for insulated drinkware; they avoid coating-related risks (Teflon-type coating, lead, BPA) that are associated with 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. The brand'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.
What is not known about PFAS in this product?
- Basis
- Model estimate, 78% 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 40oz Stainless Steel Tumbler?
- 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.