Ziploc · Food Storage Containers
Ziploc Endurables Small Container
Lower concern, rigid PP container with no known PFAS-prone coatings, but Ziploc provides no PFAS transparency.
Ziploc Endurables Small Containers are made from rigid polypropylene, a plastic without inherent PFAS contamination risk in its base form. However, Ziploc does not publicly disclose whether any coatings, treatments, or manufacturing processes introduce PFAS.
Shop Ziploc on Amazon →Material
polypropylene (PP) plastic
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
food packaging is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
The full breakdown
What it's made of and why it matters
Ziploc Endurables Small Containers are rigid polypropylene (PP), a durable thermoplastic rated for repeated use and dishwasher cycles. PP is chemically stable at room temperature and chilled storage, does not contain plasticizers like phthalates or BPA, and has a high melting point (160°C/320°F). Degradation risk is low when used within design limits (not heated above 100°C or exposed to prolonged UV). The rigid structure and snap/seal design minimize surface area contact with acidic or fatty foods compared to flexible films.
The brand's record and disclosure
Ziploc (SC Johnson subsidiary) does not publicly disclose PFAS content or testing for its food storage lines, despite industry peer pressure for transparency. No major recalls for leaching or chemical migration have been documented for Endurables containers in public safety databases. The brand has faced criticism for general opacity on chemicals but has not been linked to confirmed safety failures in this product line. Industry certification (FDA food-contact approval) applies but does not guarantee PFAS absence.
How it compares in its category
Rigid PP containers occupy the mid-tier of food storage safety: safer than older polycarbonate (PC) alternatives and flexible PVC films, comparable to glass and stainless steel substitutes in leaching risk when used correctly. Ziploc Endurables are more durable than disposable takeout containers but less transparent than brands (e.g., Pyrex, Sistema, some OXO lines) that explicitly test and disclose PFAS or boast alternative materials. Cost and convenience are competitive; chemical transparency is not a differentiator for Ziploc.
If you buy it
Keep containers out of the microwave, oven, and direct sunlight; use only for cold and room-temperature storage. Hand wash or use the top rack of a dishwasher to minimize thermal stress and extend seal integrity. Replace every 2-3 years if seals or snap closures weaken, or if visible cloudiness, cracks, or discoloration appear (signs of polymer degradation). Avoid prolonged contact with very acidic (vinegar, citrus) or fatty foods in the same container; rotate storage items to reduce chemical potential.
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.”
BPA and phthalate migration
Polypropylene does not contain BPA or phthalate plasticizers by formulation. No published studies or complaints document leaching of these compounds from Ziploc PP containers under normal use.
Microplastic shedding
Repeated heating above PP's safe range, mechanical wear (scratches, snap stress), and extended UV exposure can degrade polymer chains and release microparticles. Risk is minimal with proper use (no microwave, replacement on visible wear).
Coating or adhesive degradation
Endurables containers use snap-seal designs without adhesive coatings; seals are typically rubber or silicone. No established degradation or leaching from these materials has been reported for this product line.
Mold and bacterial growth in seals
Snap closures and seal crevices can harbor moisture and microbial growth if not thoroughly dried after washing. This is a maintenance hazard, not a chemical one; regular cleaning and air drying mitigate risk.
Off-gassing or odor transfer
New PP containers may retain manufacturing odors or absorb strong food odors (garlic, fish) that persist through washing. These are sensory and palatability concerns, not toxicological risks; odors typically fade with use and airing.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% 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.