40oz Stainless Steel Flip Straw Tumbler Spill Proof Travel Cup Double Wall Vacuum Insulated Coffee Mug with Top Handle
Low risk. Stainless steel and plastic rarely hold PFAS.
Stainless steel tumblers have minimal PFAS risk. Plastic straws and lids are potential concerns, but budget travel cups show no Teflon-family coating evidence. No brand PFAS disclosure provided.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel body, plastic straw and lid
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What 40oz Stainless Steel Flip Straw Top Handle is made of, ingredients and materials
The body is food-grade stainless steel, which is chemically inert and does not leach metals into beverages under normal use. The lid, straw, and seals are injection-molded plastic (likely polypropylene or similar commodity resin). Stainless steel resists corrosion and does not degrade into the liquid it holds, unlike ceramic glazes or aluminum coatings, which presents lower concern for leaching.
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.
Plastic leaching (lid, straw, seals)
Commodity plastics in the lid and straw may release trace oligomers or residual monomers if heated above intended temperature or if damaged. Risk is low under normal use (cold or lukewarm beverages) but increases if hot liquids are stored for extended periods or if plastic shows wear.
Bacterial growth in straw or sealed gaps
The flip straw design and lid seals create small spaces where bacteria or mold can accumulate if the tumbler is not cleaned thoroughly and dried promptly. This is a hygiene issue rather than a chemical hazard, but is common to all sealed drinkware with narrow straws.
Seal or gasket degradation over time
The rubber or silicone gaskets in the lid assembly will gradually harden and lose elasticity with repeated hot-water washing and exposure to beverages. Replacement gaskets are often not sold separately for budget brands, requiring lid replacement after 1-2 years of regular use.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
BPA & bisphenols
No BPA or BPS contamination has been reported for this product or brand. Most modern injection-molded food-contact plastics avoid these chemicals, but the brand does not provide explicit BPA-free certification documentation for this model.
Source, FDA ↗Stainless steel corrosion or nickel leaching
Food-grade stainless steel (typically 304 or 18/8 alloy) is engineered to be corrosion-resistant and does not leach significant nickel under normal use. Highly acidic beverages (e.g., vinegar, lemon juice) stored for weeks could theoretically promote minimal surface corrosion, but this is not a recognized hazard for drinkware.
How is this PFAS grade calculated?
The brand's record and disclosure
The brand has no widely documented safety incidents or recalls specific to this tumbler model. The brand does not publicly disclose material sourcing, manufacturing certifications, or testing protocols for this product line. No independent third-party certifications (e.g., BPA-free lab testing, FDA compliance statements) are listed in available product documentation. Absence of disclosure does not indicate a problem, but limits independent verification of plastic safety standards.
How it compares in its category
Stainless steel tumblers have lower concern for leaching compared to single-wall plastic or aluminum-lined cups because they eliminate leaching pathways. Most competing brands in this price range use identical material combinations (stainless steel body plus polypropylene lid and straw). Brands like Hydro Flask and YETI provide more explicit material disclosures and certifications, while the brand's transparency is typical of lower-cost manufacturers.
If you buy it
Do not expose the plastic straw or lid to boiling water or prolonged heat above 160F, as commodity plastics can soften and may release trace chemicals if degraded. Inspect the straw and lid seals every 6-12 months for cracks or discoloration; replace if damaged. Hand wash plastic components rather than dishwasher to extend lifespan. The stainless steel body itself requires no special maintenance and is durable for years.
What is not known about PFAS in this product?
- Basis
- Model estimate, 72% 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 Flip Straw Tumbler Spill Proof Travel Cup Double Wall Vacuum Insulated Coffee Mug with Top Handle?
- 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.