Airtight · Food Storage Containers
Caraway 6.6-Cup Glass Food Storage Container
Lower PFAS concern, glass container with no known problematic coatings, though gasket material warrants verification.
Caraway's 6.6-cup glass food storage container is made from borosilicate glass, an inherently low-risk material for PFAS. The primary concern is the rubber or silicone gasket seal; these materials can contain PFAS but are not guaranteed to.
Shop Airtight on Amazon →Material
borosilicate glass with silicone/rubber 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.
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
The full breakdown
What it's made of and why it matters
This container is borosilicate glass, a chemically inert material that does not leach chemicals into food regardless of temperature or acidity. Borosilicate is engineered to resist thermal shock and has lower thermal expansion than standard soda-lime glass, making it safer for repeated heating and cooling cycles. The seal uses a silicone or rubber gasket, which is food-grade and chemically stable under normal refrigeration and mild heating. This combination eliminates the primary leaching hazards present in plastic food storage.
The brand's record and disclosure
Caraway (the Airtight line) has maintained a clean public safety record with no documented recalls or safety violations on file for this product category. The brand has not published detailed material certifications or third-party test results for this specific container, and their PFAS stance remains undisclosed. However, the absence of reported incidents and the choice of borosilicate glass as the primary material aligns with food-safety best practices. No credible controversies have emerged regarding this product line.
How it compares in its category
Glass storage containers like this occupy a premium safety tier compared to standard polycarbonate or polypropylene alternatives, which carry documented risks of BPA/BPS leaching and microplastic shedding with heat. Borosilicate glass eliminates the need for polymer coatings or chemical barriers. The trade-off is weight, breakage risk, and higher cost; however, from a chemical safety standpoint, glass containers avoid the hazard landscape of most plastics.
If you buy it
Inspect the silicone gasket before first use for cracks or discoloration; replace it annually or sooner if it becomes stiff, cracked, or develops mold. Do not subject the container to extreme thermal shock (e.g., oven to ice water immediately) despite borosilicate's resilience. Hand-wash the gasket separately to prevent bacterial biofilm buildup in the seal. Glass itself is dishwasher-safe, but the gasket benefits from gentler handling to extend its 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 gasket degradation
Silicone gaskets can harden, develop mold, or tear with age and repeated thermal stress. Cracked seals compromise airtightness and may harbor bacteria. No specific failures reported for this product, but degradation is material-dependent and requires periodic replacement.
Glass breakage/sharp fragments
Borosilicate glass is more durable than standard soda-lime glass but can still chip or shatter if dropped or subjected to thermal shock. Fragments pose a contamination risk to food and injury risk to hands. This is a mechanical hazard common to all glass storage containers.
Microplastic shedding from gasket
Food-grade silicone gaskets used in this product do not shed microplastics under normal conditions. No evidence of degradation into small particles has been documented for Caraway containers or similar borosilicate glass products.
Heavy metals in borosilicate glass
Borosilicate glass is formulated without lead, cadmium, or other heavy metals as primary constituents. No contamination has been reported in Caraway products. Glass manufacturing regulations in developed markets prohibit lead use in food-contact glass.
Bacterial or mold growth in seal
The silicone gasket and crevices around the lid can trap moisture and food residue, creating conditions for mold or bacterial biofilm if not cleaned thoroughly and dried. Proper maintenance (hand-washing, air-drying) mitigates this risk.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 82% 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.