Ziploc · Food Storage Containers
Ziploc Mini Rectangle Food Storage Containers (4 ct)
Lower concern, rigid PP containers lack typical PFAS coatings, but no brand transparency on seals.
Ziploc mini containers are rigid polypropylene food storage with snap-lock lids and gaskets. PP is a standard plastic without inherent PFAS, but Ziploc has not publicly disclosed whether gasket materials contain PFAS-based water/grease repellents.
Shop Ziploc on Amazon →Material
polypropylene (PP) plastic with sealing gasket
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 Mini Rectangle containers are polypropylene (PP), a relatively inert plastic rated for food contact and approved by the FDA. Unlike polycarbonate or older plastics, PP does not contain BPA or BPS, and its chemical stability means minimal leaching under normal kitchen use. The sealing gaskets are typically elastomer-based (often TPE or silicone) but their exact composition is not publicly disclosed by Ziploc; these gaskets present the main leaching risk if degraded or exposed to solvents.
The brand's record and disclosure
Ziploc (owned by SC Johnson) has no documented recalls specific to chemical leaching from these mini containers. The brand does not publicly commit to PFAS-free formulations or provide detailed material safety data sheets for gasket components, which is standard industry silence rather than a red flag. SC Johnson has faced environmental criticism on other product lines but maintains regulatory compliance for food storage containers. No major safety controversies are on record for this specific product line.
How it compares in its category
Rigid PP food storage is among the safest plastics for cold and room-temperature storage; glass alternatives (like Pyrex) eliminate leaching risk but add breakage and cost. Other polypropylene brands (Rubbermaid, OXO) offer comparable safety profiles with similar lack of seal-composition transparency. Ziploc's mini rectangle format is not a premium product but is competitively positioned in durability and cost; the smaller volume reduces surface-area risk for degradation.
If you buy it
Keep containers away from heat sources and do not microwave with contents inside (PP softens above 110°C). Wash by hand or on gentle cycles; dishwasher heat can degrade gaskets over time. Replace containers if gaskets become visibly cracked, discolored, or unable to seal properly. Do not store fatty or acidic foods (oils, vinegar, citrus) for extended periods, as these can accelerate minor leaching from gasket materials.
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.”
Gasket/seal degradation and leaching
Ziploc does not disclose gasket material composition; elastomer seals can degrade under heat, detergent, or prolonged storage of solvents or acidic foods, potentially releasing trace plasticizers. Risk is low under normal use but increases with age.
Polypropylene leaching (general)
PP is chemically stable and not known to leach BPA, BPS, or phthalates under normal food storage conditions. No documented issues specific to Ziploc mini containers.
Microplastic shedding
Repeated washing, stacking, and contact with abrasive foods can cause microscopic surface wear of PP, releasing tiny plastic particles into stored food. Risk increases as containers age; replacement every 2-3 years of heavy use is prudent.
Heat-induced warping and leaching
PP is not heat-stable above 110°C; microwaving or hot-water exposure can cause softening and chemical migration, particularly from gaskets. This is avoidable with proper use but remains a design limitation.
Mold or bacterial growth in seals
Ziploc seals have crevices where moisture and food residue can trap bacteria or mold if not thoroughly dried. This is a maintenance issue, not a chemical hazard, but affects food safety in damp storage conditions.
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.