Stanley Comeback Lunchbox
Lower concern. Stainless steel lunchbox with no known PFAS sources.
Stanley's classic stainless steel lunchbox uses rigid metal construction with minimal coatings. No PFAS-related features identified, though brand provides no explicit disclosure.
We flunk more products than we pass. This one earned its grade. How we grade
Material
stainless steel body, plastic latch and lid
Lab data
No public lab test
What Stanley Comeback Lunchbox is made of, ingredients and materials
The Stanley Comeback Lunchbox uses a stainless steel body, which is chemically inert and does not leach metals or compounds into food under normal use. The lid and latch are plastic, likely polypropylene or similar commodity plastic. Stainless steel is preferred for food contact because it forms a passive oxide layer that resists corrosion and migration; plastic components in latches and seals are lower-risk provided they do not contact hot food directly.
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.
BPA & bisphenols
Plastic components are not specified as BPA/BPS-free on record. Risk is low if plastic remains below 60°C and does not contact hot or oily foods, but Stanley has not disclosed additive composition.
Source, FDA ↗Phthalate plasticizers in latches
Older or budget plastic hinges and seals may contain phthalates. Not confirmed for this model, but no certification or testing data is publicly available.
Microplastics
If the plastic lid is used in heat or abrasive cycles, surface wear could generate microplastics over years. Not specific to Stanley's formulation, but a long-term concern for any plastic food-contact component.
Source, EPA ↗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)
Stainless steel food contact is regulated and leaching is negligible under normal use. Acidic foods (vinegar, citrus) can increase migration slightly, but levels remain below food-safety thresholds for 300+ series alloys.
Off-gassing from plastic seals
No documented VOC or odor off-gassing from Stanley latches. Stainless steel does not off-gas; risk depends on plastic resin choice and cure, which are not disclosed.
The full breakdown
The brand's record and disclosure
Stanley has not published transparency reports on BPA, phthalates, or food-contact polymer testing for this product. The brand maintains a long heritage in rugged goods but has not made public commitments to avoid BPA/BPS or phased out other regulated additives in food-contact plastics. No major recalls or contamination incidents are on record for this lunchbox model.
How it compares in its category
Stainless steel lunchboxes are among the lowest-concern options in rigid food storage, avoiding BPA/BPS and phthalate leaching that can occur in polycarbonate or vinyl-lined containers. Most competitors in the insulated lunchbox category use plastic bodies or liners, which carry higher potential for polymer additives. Stanley's use of stainless steel as the primary food-contact surface aligns with safer-by-design food storage practice.
If you buy it
Keep the plastic latch and lid away from direct heat; do not use in dishwashers set to high temperature or microwaves if the latch is not removable. Stainless steel does not require special cleaning and resists scratching and corrosion from typical food acids. Inspect plastic seals periodically for cracking or degradation. Rinse after use to prevent odor retention; stainless steel does not absorb flavors but can retain them on the surface if not cleaned promptly.
What we don’t know
- Basis
- Model estimate, 72% 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.
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More lunch boxes 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.