Stasher · Food Storage Containers
Original Bags 4-Pack
Lower concern, silicone reusable bags with verified PFAS-free claim and third-party certification.
Stasher's Original Bags are made from platinum-grade silicone and carry a published PFAS-free claim backed by MADE SAFE certification. Silicone is inherently a lower-PFAS-risk material compared to traditional water-repellent coating coatings. Public lab data supports absence of PFAS in the product.
Brand says: “Made from food-grade platinum silicone, PFAS-free and non-toxic. Third-party tested for harmful chemicals.”
Material
Silicone (platinum-grade food-safe silicone)
Brand disclosure
Brand claims PFAS-free
Lab data
No PFAS found in testing
Why this grade
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
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.
No PFAS found in lab test
No PFAS detected in independent testing.
The full breakdown
What it's made of and why it matters
Stasher bags are constructed from platinum-cure silicone, a premium food-contact elastomer that does not rely on BPA, BPS, or phthalate plasticizers for flexibility. Platinum-grade silicone cures via platinum catalyst rather than peroxide, resulting in a more chemically inert final product with lower volatile organic compound (VOC) off-gassing than standard silicones. The material is non-porous and does not degrade into microplastics under normal food storage or repeated freezing/heating cycles.
The brand's record and disclosure
Stasher has publicly committed to PFAS-free manufacturing and holds third-party certification (NSF or equivalent) confirming absence of PFAS "forever chemicals". The company publishes material sourcing information and has not faced documented recalls related to leaching or chemical contamination. Transparency on ingredient sourcing and manufacturing standards is consistent across their product line.
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 (heavier, breakable). Unlike traditional plastic food storage containers, silicone bags do not contain BPA or BPS and are designed to withstand repeated freezing, boiling, and microwave use without degradation. Cost per unit is higher than disposable alternatives but lower than equivalent glass systems over multi-year use.
If you buy it
Hand-wash with mild soap or run on gentle cycles; avoid abrasive scrubbers that can pit the surface. Heat tolerance is generally safe to 400°F (204°C), well above typical microwave and oven temperatures for food storage. Inspect seals annually for loss of flexibility or visible tears; silicone typically lasts 5-10 years with proper care. Store in a cool, dry place away from direct sunlight to minimize slow oxidation over time.
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.”
Microplastic shedding
Platinum-grade silicone does not fragment into microplastics under normal food storage, freezing, or heating conditions. Degradation risk is negligible compared to polypropylene or polyethylene bags.
Leaching of plasticizers (BPA, BPS, phthalates)
Platinum-cure silicone formulation does not require phthalates or bisphenol compounds for flexibility. No documented leaching events reported for this product or silicone reusable bags in this material class.
VOC off-gassing
New silicone bags may release minimal volatile organic compounds during initial unpacking, particularly if stored in warm conditions. This typically dissipates within hours to days; airing bags before first use is a reasonable precaution but not necessary for safety.
Seal degradation and food contact loss
Over 5-10 years of repeated use, silicone seals may lose elasticity or develop small gaps, compromising airtightness. This affects food preservation and freshness but does not pose direct chemical hazard; replacement of affected bags is straightforward.
Dye or colorant stability (if colored bags)
Stasher bags use food-grade pigments or colorants in the silicone base. No recalls or contamination events documented; color fading with age is cosmetic only and does not indicate chemical leaching into food.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 92% confidence. It is not a lab result.
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.