Stasher · Food Storage Containers
Stasher 3-Pack Reusable Silicone Storage Bags
Lower-concern option; silicone bags avoid Teflon-type coating/nonstick coatings, but brand lacks explicit PFAS commitment.
Stasher bags are made from silicone, not Teflon-family coating-coated materials, which eliminates the primary PFAS pathway in food storage. The brand does not publicly disclose PFAS testing or make PFAS-free claims. No independent lab data or recalls flagged; silicone itself is not a known PFAS delivery medium in this category.
Shop Stasher on Amazon →Material
platinum-grade silicone
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
food packaging 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
Stasher bags are molded from platinum-grade silicone, a food-safe elastomer that does not require nonstick coatings like Teflon-type coating or PFOA-containing treatments. Platinum-cure silicone is chemically cross-linked and highly stable when used within normal temperature ranges, meaning it does not leach monomers or degradation byproducts into food under typical storage conditions. Unlike plastic film or laminated alternatives, silicone does not contain BPA, phthalates, or microplastics that migrate when heated or stressed. The material's stability is its primary safety advantage in the food storage category.
The brand's record and disclosure
Stasher has marketed these bags as a sustainable plastic-reduction alternative and emphasizes food-grade silicone credentials, but the company provides no public third-party testing data, toxicology reports, or explicit PFAS commitment. The brand does not publish full ingredient sourcing or manufacturing details that would allow verification of contaminant-free processing. No formal recalls or safety complaints have been documented for Stasher bags on the CPSC database or in consumer reports. The silence on PFAS content and material chain transparency reflects a gap in disclosure rather than a known problem.
How it compares in its category
Silicone bags occupy a middle ground between rigid plastic containers (BPA risk, rigid Teflon-type coating coatings in premium versions) and laminated films (microplastic shedding, heat sensitivity). Glass and stainless steel alternatives eliminate leaching concerns entirely but lose reusability and portability. Among reusable silicone storage solutions, Stasher is mainstream and competitively priced; comparable brands (e.g., Lekue, Bumkins) use similar platinum silicone but also rarely disclose PFAS testing. Silicone bags as a category represent one of the lower-risk options for food storage from a chemical exposure standpoint.
If you buy it
Stasher bags are safe for storage of room-temperature and refrigerated foods; avoid prolonged contact with very hot liquids or oven use above the stated temperature limit (typically 400F). Hand wash or machine wash on gentle cycle; do not use abrasive scrubbers that could degrade the silicone surface. Inspect monthly for visible cracks, cloudiness, or odor changes; silicone degrades slowly over years of use, and bags should be replaced if structural integrity is compromised. Store in a cool, dry location away from direct sunlight to extend life.
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 monomer leaching (cyclic and linear siloxanes)
While platinum-cure silicone is highly stable, trace amounts of cyclic siloxanes (D4, D5) may migrate into fatty or oily foods under thermal stress or prolonged storage. This is a known characteristic of silicone materials and not specific to Stasher, but no published testing of Stasher bags for siloxane migration is available.
BPA, BPS, or phthalate contamination
Silicone does not require or contain BPA, BPS, or phthalate plasticizers by its chemical structure. No documented cases of these additives in platinum-grade silicone storage bags exist.
Microplastic or fragmentation into food
Platinum silicone does not degrade into microplastics under normal use. Wear or tear can cause surface cracking, but this is visible and can prompt replacement before particles enter food.
Heavy metal contamination from pigments or processing aids
Food-grade silicone certification does not guarantee comprehensive heavy metal testing. If Stasher bags contain pigments or reinforcing fillers, trace cadmium or lead remains theoretically possible, though no recalls or test results have documented this.
Off-gassing or odor upon first use
New silicone products sometimes emit a faint rubbery or chemical odor due to residual processing volatiles; this typically dissipates after washing and airing. It is not evidence of toxicity but may indicate incomplete removal of manufacturing byproducts.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 78% 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 Food Storage Containers
Caraway
Food Storage Set
Glass containers with plastic lids
Lower concern; glass + plastic lids with stated PFAS-free position, but no third-party verification of lid material.
⚠Risky category by default
Caraway
Home 9-Piece Mini Food Storage Set
Borosilicate glass containers with plastic lids
Lower-concern option; glass containers avoid PFAS coatings, but verify lid material before purchase.
⚠Risky category by default
Caraway
Cream 6.6-Cup Non-Stick Glass Food Storage Container with Lid
borosilicate glass with non-PFAS lid
Lower PFAS concern, glass container with stated non-PFAS lid, though third-party verification absent.
⚠Risky category by default
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.