Stasher · Food Storage Containers
Stasher Premium Silicone Reusable Food Storage Bags Multi
Lower PFAS concern, silicone bags with credible PFAS-free claim and third-party testing.
Stasher Premium bags are made from platinum-grade silicone, not Teflon-type coating or Teflon-family coating-coated materials that typically harbor PFAS. The brand explicitly claims PFAS-free status and holds MADE SAFE certification, which requires testing for PFAS and other harmful chemicals.
Brand says: “Stasher products are made from platinum-grade silicone and are PFAS-free.”
Material
Food-grade silicone (primary); no Teflon-family coating
Brand disclosure
Brand claims PFAS-free
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
food packaging is a category where PFAS exposure is more common.
Third-party PFAS-free verification
Independently verified PFAS-free by a third party.
The full breakdown
What it's made of and why it matters
Stasher Premium bags are constructed from food-grade silicone, a synthetic rubber polymer that forms a chemically inert matrix when properly cured. Unlike plastic storage containers, silicone has no BPA, BPS, or phthalate precursors in its backbone structure because it is not a thermoplastic. The material's cross-linked polymer chains resist breakdown from heat and repeated flexing, which is why silicone is preferred for reusable food contact applications. The brand's PFAS-free claim is supported by third-party testing, which is notable because some silicone manufacturing processes historically involved fluorinated additives.
The brand's record and disclosure
Stasher has publicly committed to PFAS-free manufacturing and provides third-party testing documentation for this claim, distinguishing it from brands that make unsubstantiated assertions. The company has not faced major recalls or safety enforcement actions in public records related to food storage products. Stasher publishes material safety data and ingredient transparency on its website, which is consistent with brands focused on the reusable/sustainability market segment. No established controversies regarding heavy metal contamination or formaldehyde in silicone products from this manufacturer are documented in regulatory databases.
How it compares in its category
Silicone reusable bags occupy a middle ground between single-use plastics (higher microplastic and chemical leaching risk) and glass containers (heavier, breakable). Unlike traditional plastic food storage, silicone does not degrade into microplastics when heated to normal food temperatures because it is thermosetting rather than thermoplastic. Compared to other reusable silicone bag brands, Stasher's PFAS-free verification and third-party testing are above-average transparency measures. The primary trade-off versus alternatives is higher upfront cost and potential durability questions if seals degrade over years of use.
If you buy it
Store at temperatures up to the manufacturer's stated limit (typically 350-400 degrees Fahrenheit for brief periods; do not exceed because silicone's thermal stability is material-dependent). Hand wash or gentle machine cycles recommended; abrasive scrubbing and dishwasher heat cycles accelerate seal wear. Replace bags if you notice visible cracks, clouding, or persistent odor absorption that does not wash out, as these indicate polymer degradation. Do not expose to direct flame or extremely high heat; keep away from sharp objects that pierce the material.
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.”
Silicone polymer degradation and microparticle release
Food-grade silicone is thermosetting and much more stable than plastics, but prolonged exposure to extreme heat or aggressive mechanical stress (folding, crease fractures) can cause microscopic particle shedding. No recalls or peer-reviewed studies documenting significant microparticle migration from intact silicone food bags at normal use temperatures are on record.
Seal material and closure component leachables
Stasher bags use silicone seals, not PVC or plastic closures. No published safety concerns specific to silicone seal leaching in food storage applications have been documented in regulatory or academic literature.
Residual manufacturing additives or cross-linkers
Food-grade silicone must meet FDA Title 21 CFR 177.2600 for food contact, which limits residual compounds. Stasher's third-party testing includes verification of this standard, and no violations or contamination reports are publicly available.
Odor absorption and potential off-flavor transfer
Silicone is lipophilic (fat-attracting) and can absorb strong odors or colored compounds from foods over time, which may persist even after washing. This is a quality-of-life issue rather than a toxicological hazard, but user reviews document occasional off-flavor transfer with strongly scented foods.
Lead or cadmium in colorants or additives
Food-grade silicone formulations used in certified products are required to exclude heavy metal pigments. No recalls or test failures for lead, cadmium, or chromium in Stasher bags are documented in FDA or CPSC records.
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.
Formulations and coatings change between production runs. Always check the current label before buying.
More food storage containers 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.