Stanley · Insulated Travel Mugs
Stanley IceFlow 2.0 Flip Straw Tumbler
Stainless steel body unlikely to contain PFAS, no known risk.
Primarily stainless steel with plastic flip straw lid. No evidence of PFAS-prone coatings or water-resistant treatments on the tumbler itself.
The better-graded swap
Thermos
Thermos Icon 16 oz Stainless Steel Mug
80/100 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
Stainless steel tumbler, plastic flip straw lid
Lab data
No public lab test
What Stanley IceFlow 2.0 Flip Straw Tumbler is made of, ingredients and materials
The IceFlow 2.0 tumbler body is stainless steel, which is chemically inert and does not leach metals under normal beverage storage conditions. The flip straw lid and sealing gaskets are plastic (likely polypropylene or similar thermoplastic); these components contact only cold or room-temperature liquid, which substantially reduces leaching risk compared to hot-fill scenarios. Stainless steel avoids the lead/cadmium glazing and ceramic coating concerns that apply to traditional ceramic or enameled cookware.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
BPA & bisphenols
Plastic components in contact with beverages carry low but nonzero risk if material composition is not disclosed. Cold-liquid use minimizes migration, but identity of specific plastic resin is not stated by Stanley in available product information.
Source, FDA ↗Degradation of plastic seals/gaskets over time
User reviews on multiple platforms document lid seal degradation and straw cracks after months of use; this is typical wear but increases leaching surface area and drinking-water safety if fragments are ingested or mold colonizes cracks.
Bacterial growth in straw and lid crevices
Flip straw designs are difficult to fully dry and sanitize; if left wet or refilled without cleaning, straw channels can harbor mold and bacteria. This is a hygiene risk independent of material toxicity.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Stainless steel leaching (nickel, chromium)
Food-grade stainless steel (typically 18/8 or 316) is stable under beverage storage conditions and poses negligible risk of metal ion release in neutral or slightly acidic drinks at room temperature.
Coating integrity of stainless steel (rare concern)
No recalls or known issues reported for Stanley IceFlow stainless steel coating degradation; electropolished food-grade stainless does not degrade under normal beverage use.
The full breakdown
The brand's record and disclosure
Stanley has not made public statements specifically addressing PFAS or PFOA in their drinkware lines. The company offers no visible third-party safety certifications (NSF, FDA, etc.) for this product on major retail listings. Stanley is a legacy brand with a history in outdoor/industrial equipment; modern drinkware lines are relatively recent entries without established independent safety testing on record.
How it compares in its category
As a stainless steel tumbler, the IceFlow 2.0 avoids the leaching vulnerabilities of aluminum tumblers (which can shed metal ions at low pH) and ceramic-lined options (which carry glaze contamination risk). The plastic lid is a weak point compared to all-metal tumblers, but lid design is standard across this product class. Compared to glass or ceramic insulated cups, stainless steel is superior for durability and eliminates breakage-related hazards.
If you buy it
Use this tumbler only for cold or room-temperature beverages; do not fill with hot liquids, as heat could increase plastic component leaching. Hand wash the lid and straw rather than dishwasher to extend plastic lifespan and reduce stress cracking. Replace the lid if visible cracks, discoloration, or odor develop. Clean the straw regularly with a brush to prevent bacterial biofilm buildup, especially if used for dairy or smoothies.
What we don’t know
- Basis
- Model estimate, 75% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Stanley has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
Better-graded alternatives in Insulated Travel Mugs
Owala
FreeSip Sway Stainless Steel
- Stainless steel body, no interior coating disclosed
- Silicone and plastic lid/valve leachables
3 hazards checked on this product. See all of them.
Owala
Stainless Steel Straw Tumbler Route 66
- Stainless steel tumbler, bare uncoated
- Coating degradation and microplastic shedding from exterior print
3 hazards checked on this product. See all of them.
Thermos
18 oz. Icon Vacuum Insulated Stainless Steel Mug
- stainless steel exterior, vacuum insulation, stainless steel interior
- We found no PFAS statement from the brand
- Nickel leaching from stainless steel
3 hazards checked on this product. See all of them.
More insulated travel mugs 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.