Stanley · Insulated Drink Tumblers & Travel Mugs
Stanley Everyday Tumbler
Stanley tumblers are stainless steel. Lower PFAS concern than nonstick cookware.
Stanley Everyday Tumblers are stainless steel vacuum-insulated drinkware with no reported nonstick coatings or water-repellent treatments. No PFAS disclosure found, but the bare metal construction presents lower concern than coated cookware.
The safe swap
Yeti
Rambler Tumbler YETI
80/100 safety
Same rubric that flunked this product. The swap earned its B.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
stainless steel, vacuum insulated
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
cookware 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
The Stanley Everyday Tumbler is constructed from 18/8 stainless steel (304 grade), a chromium-nickel alloy that resists corrosion and does not require protective coatings. Unlike ceramic-coated or nonstick cookware, stainless steel has no glaze, enamel, or Teflon-family coating surface that can degrade, flake, or leach into food and beverages. Vacuum insulation between double walls is typically foam or air with no food-contact surface, so the insulation material is not a direct hazard.
The brand's record and disclosure
Stanley has not publicly disclosed comprehensive material safety data sheets or third-party certifications for the Everyday Tumbler line. The brand has not been party to major product safety recalls involving tumblers in recent public records. Stanley's parent company (PMI) does not maintain visible transparency on PFAS use in drinkware seals or gaskets, leaving that risk profile unclear despite the stainless steel body itself posing minimal concern.
How it compares in its category
Stainless steel tumblers are among the safest options in the drinkware category because they avoid the hazards of ceramics (lead in glazes), plastics (BPA, phthalates), and nonstick coatings (Teflon-type coating degradation). The Everyday Tumbler's vacuum insulation design is standard for insulated drinkware and poses no established safety risk. Price and durability put it on par with Hydro Flask and Yeti, all of which rely on similar stainless steel construction.
If you buy it
Wash by hand or upper-rack dishwasher; aggressive machine washing may damage seals over time. Do not expose to extreme temperature swings (e.g., boiling water followed by ice water) as this can stress the seal and gasket. Replace the silicone lid gasket if it becomes cracked, discolored, or develops odor, as degraded gaskets may trap bacteria or leach rubber compounds. Avoid prolonged storage of acidic beverages (vinegar, citrus juice) if the lid gasket shows wear, as some rubber compounds can degrade under acidic conditions.
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.”
Aluminum leaching
Stainless steel construction eliminates aluminum contact. This product poses no aluminum leaching risk.
Lead or cadmium in coatings or glazes
Vacuum-insulated stainless steel tumblers do not use ceramic glaze, enamel, or paint finishes. No lead or cadmium exposure pathway is established for this product type.
Teflon-type coating fume risk (nonstick coating degradation)
The Stanley Everyday Tumbler uses no nonstick or Teflon-family coating surface. Teflon-type coating fume hazard does not apply to stainless steel drinkware.
Silicone gasket and lid degradation
Silicone seals and gaskets on the removable lid can crack, discolor, or leach rubber compounds over time with repeated washing, thermal stress, or exposure to acidic beverages. Stanley does not publicly specify the composition of lid materials or replacement intervals.
Bacterial growth in seals and insulation gaps
Narrow gaps between the inner and outer stainless steel walls and around lid seals can trap moisture and organic matter if not dried thoroughly. Improper cleaning or long-term storage with residual liquid may permit mold or bacterial biofilm formation, though this is a maintenance issue rather than a manufacturing hazard.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 82% 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 Drink Tumblers & Travel Mugs
Yeti
Rambler Tumbler YETI
18/8 stainless steel, no coating
Lower concern. Bare stainless steel tumbler, no known PFAS risk.
⚠Risky category by default
OtterBox
Elevation 20 Tumbler
Stainless steel tumbler with powder coat or polyester exterior
Lower PFAS concern; stainless steel construction poses minimal risk.
⚠Risky category by default
Stanley
Stanley Quencher H2.0 Flowstate TUMBLER
Stainless steel body, plastic lid and base
Lower PFAS concern. Stainless steel body poses minimal risk.
⚠Risky category by default
More insulated drink tumblers & 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.