Airtight · Food Storage Containers
Caraway Glass Airtight Container Set
Lower-concern choice, glass is PFAS-safe, but plastic lids lack transparency.
Caraway's glass containers are made from borosilicate glass, which has no inherent PFAS risk. However, the plastic lids' composition and any coatings are not disclosed by the brand.
Shop Airtight on Amazon →Material
Borosilicate glass containers with plastic lids
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
Caraway Glass containers use borosilicate glass, a chemically inert material that does not leach chemicals into food regardless of temperature or storage duration. The lids are plastic, likely polypropylene (PP) or polystyrene (PS) based on typical market offerings in this category, which do not intentionally contain BPA or phthalates but can migrate trace additives under heat stress. The glass-plastic hybrid design isolates the primary food contact surface (glass) from leaching risk while introducing a secondary plastic interface that requires proper usage.
The brand's record and disclosure
Caraway (parent company unclear from public record; marketed as 'Caraway Home') has not published detailed material sourcing, chemical testing, or third-party safety certifications for these containers. The brand maintains a direct-to-consumer marketing stance emphasizing 'clean' materials without substantiating independent lab reports for BPA/BPS/phthalate absence. No documented recalls or safety controversies specific to this product line are on public record. Transparency on plastic lid resin sourcing and migration testing remains absent.
How it compares in its category
Borosilicate glass containers rank among the safest food storage options; competitors like OXO, Pyrex, and Rubbermaid use similar glass cores with comparable plastic lids. This product avoids the microplastic shedding risk of pure-plastic containers (Tupperware, Rubbermaid Brilliance) and the potential lead/cadmium hazard of some ceramic or enameled alternatives. The main differentiator is brand transparency: competitors like Pyrex publish material specs more openly, while Caraway relies on marketing claims rather than published certifications.
If you buy it
Keep plastic lids away from direct contact with hot or oily foods; allow cooked food to cool before sealing to minimize plastic additive migration. Do not microwave the containers with lids sealed or attached. Inspect lids annually for stress cracks, cloudiness, or warping; replace if degradation occurs, as aged plastic releases more additives. Glass containers are durable, but lids typically degrade in 3-5 years with repeated use; budget for lid replacement rather than full set replacement.
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/BPS and phthalates in plastic lids
Caraway does not disclose plastic resin type or additive list. Polypropylene and polystyrene lids generally do not intentionally contain BPA, but trace migration of non-intentional additives is possible under heat or prolonged contact with fatty foods. Risk is low if lids do not contact hot food directly.
Plastic lid degradation over time
Repeated washing, thermal cycling, and exposure to oils and acidic foods cause plastic lids to degrade (stress cracks, cloudiness, leaching). Caraway does not specify material durability or replacement intervals, leaving users to judge when lids have expired. Degraded lids pose a higher risk of additive migration than new ones.
Microplastics from lid wear
As plastic lids age and crack, particles may shed into stored food. The risk is lower than with containers made entirely of soft plastic, but users should visually inspect lids regularly and discard visibly cracked or degraded ones.
Thermal shock damage to borosilicate glass
Borosilicate glass is designed to withstand temperature extremes, but rapid temperature changes (e.g., transferring hot containers to ice water) can cause cracking. No recalls or public incidents specific to Caraway Glass containers are documented; standard precautions apply.
Lid-seal integrity and moisture retention
Airtight claims depend on consistent seal quality. If lids warp or seals degrade, containers may not remain airtight, potentially allowing bacterial growth in humid conditions or mold on acidic foods. Caraway does not publish gasket material or seal durability data.
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.