Prepara Latchlok Click Stainless Steel Food Storage Container Set
Lower concern. Stainless steel containers with silicone seals pose minimal PFAS risk.
Stainless steel food containers are not associated with PFAS materials. Silicone gaskets used in lids are not typically treated with PFAS, though the brand makes no explicit disclosure.
We flunk more products than we pass. This one earned its grade. How we grade
Material
stainless steel with silicone gasket seals
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What Prepara Latchlok Click Stainless Steel is made of, ingredients and materials
This product uses 18/8 or 18/10 stainless steel (austenitic grade), which is highly resistant to corrosion and does not leach metals into food under normal storage conditions. Silicone gasket seals are inert, non-reactive materials that do not release BPA, phthalates, or other endocrine disruptors when in contact with food or liquids. The rigid stainless steel construction avoids the microplastic shedding risk associated with plastic containers, and the sealed design prevents moisture ingress and contamination.
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.
Silicone gasket degradation over time
Silicone seals are durable but not permanent; repeated thermal stress, acidic foods, or prolonged storage can cause loss of elasticity or cracking, which may compromise the airtight seal and allow bacterial or mold colonization.
Seal harboring bacteria or mold if improperly maintained
The gasket channel in click-latch containers can trap food residue or moisture if not thoroughly cleaned. Poor drying or infrequent seal replacement may allow bacterial biofilm or mold growth, particularly with prolonged storage of wet foods.
What’s reassuring
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
Stainless steel minor nickel or chromium leaching
High-grade stainless steel (18/8) used in food containers is extremely resistant to leaching under normal storage conditions. No published recalls or reports of nickel/chromium leaching from this product exist; risk is negligible.
BPA & bisphenols
Food-grade silicone gaskets do not contain BPA or phthalates by design and regulation. No evidence of non-compliant materials in Prepara seals is on record.
Source, FDA ↗The full breakdown
The brand's record and disclosure
Prepara has no established history of product recalls, safety alerts, or material-composition controversies in public records. The brand does not publish detailed safety certifications or third-party testing reports on their website; PFAS stance is not explicitly communicated. No evidence of regulatory action or consumer safety complaints specific to this container line is available.
How it compares in its category
Stainless steel containers are among the lower-concern options for food storage compared to single-use plastics, BPA-free polycarbonate alternatives, or glass (which breaks). Silicone seals are chemically inert and do not off-gas like some plastics; they are widely used in food-grade applications. This product avoids the coating-degradation and leaching risks present in enameled cast iron or ceramic storage containers.
If you buy it
Hand wash or use gentle dishwasher cycles to preserve seal integrity; prolonged high-temperature washing may shorten gasket lifespan. Do not expose to temperatures above manufacturer specifications (typically under 80 degrees Celsius for storage); stainless steel itself is stable, but seals may degrade. Replace silicone gaskets every 1-2 years if they show visible wear, cracking, or loss of elasticity. Inspect seals regularly for mold or bacterial growth, especially if used for acidic or oily foods.
What we don’t know
- Basis
- Model estimate, 82% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Prepara has made none
Formulations change between production runs, so check the current label. How we grade.
Better-graded alternatives in Lunch Boxes
Klean Kanteen
Double Wall Vacuum Insulated Stainless Steel Food Canister Container with Leak Proof Lid
- Stainless steel body, silicone gasket lid seal
- The brand calls it PFAS-free, which we have not verified
- Silicone gasket degradation
3 hazards checked on this product. See all of them.
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.