Stasher · Food Storage Containers
Stasher Premium Silicone Reusable Food Storage Lunch Starter Kit
Lower PFAS concern, silicone food storage avoids common PFAS-prone coatings, but no public PFAS disclosure from brand.
Stasher's silicone containers use a material class that does not typically require PFAS-based treatments for water or grease resistance. However, Stasher has not publicly claimed PFAS-free status or sought third-party verification.
Shop Stasher on Amazon →Material
Food-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 made from food-grade silicone, a synthetic rubber polymer that does not contain BPA, phthalates, or PVC. Silicone is chemically inert across typical food storage temperatures (freezer to microwave reheat), meaning it does not leach plasticizers or endocrine disruptors into food the way some plastics do. The material is non-porous, reducing bacterial colonization risk compared to cloth or wood alternatives.
The brand's record and disclosure
Stasher does not publicly disclose detailed testing data, manufacturing standards, or third-party certifications (e.g., NSF, SGS) on their website. The brand claims FDA compliance and food-grade certification but provides no verifiable documentation link. No major product recalls or contamination incidents are on record for this product line. The company's silence on PFAS testing is consistent with many silicone-container makers but limits independent verification.
How it compares in its category
Silicone food storage is safer than polycarbonate (BPA risk) and polyvinyl chloride (phthalate leaching), but comparable in safety to borosilicate glass and high-density polyethylene (HDPE). Unlike glass, silicone offers durability and ease of use. Unlike plastic wrap and paper bags, silicone avoids single-use waste and associated manufacturing contaminants. Price sits at a premium, reflecting the material cost.
If you buy it
Do not heat sealed silicone bags above 400°F (204°C) to avoid degradation; microwave reheating with bags open is safe. Hand wash in warm soapy water or run on top rack of dishwasher; avoid harsh abrasives that scratch the surface. Replace bags if seams separate, discoloration appears, or odors persist after washing. Store flat or rolled in a cool, dry cabinet to extend lifespan (typically 5+ years with normal use).
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 leaching at high temperatures
While food-grade silicone is chemically stable at normal cooking and storage temperatures, prolonged exposure above 400°F or repeated heating in direct flame may cause minor degradation and release of trace oligomers. Risk is low for standard microwave or dishwasher use.
Bacterial growth in seams and seals
Silicone bags have sealed seams that can trap moisture and food particles if not thoroughly cleaned. Improper drying or storage in humid conditions may allow mold or bacterial biofilm growth; regular hand inspection and air drying mitigate this.
Color additives and pigment safety
Stasher bags are typically offered in multiple colors (clear, pastel, dark). No published testing for heavy metals (cadmium, lead) in dyes has been found. Food-grade silicone typically uses safer colorants than non-food plastics, but brand does not disclose pigment sources.
Microplastic shedding
Silicone is not prone to fragmentation or microplastic release like degraded polycarbonate or polyethylene. No data suggests Stasher bags shed microparticles during normal use or washing.
Odor retention and off-gassing
Silicone can absorb and retain strong food odors (garlic, fish, curry); some users report persistent smells. This is a usability issue rather than a safety hazard, but indicates porous characteristics that may harbor residual bacteria if not cleaned thoroughly.
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.