Waste Free Pantry · Food Storage Containers
Caraway 4.4 Cup Glass Food Storage Container
Lower concern; glass container itself is inherently PFAS-free, but lid material composition and any seals warrant verification.
The glass body of this food storage container carries minimal PFAS risk, glass is an inert, non-fluorinated material. However, Caraway does not appear to have third-party lab testing or independent certification (e.g., MADE SAFE) backing its PFAS-free claims.
Brand says: “Caraway markets containers as 'PFAS-free' and part of their sustainability/health-conscious positioning”
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borosilicate glass with plastic lid (material unspecified)
Brand disclosure
Brand claims PFAS-free
Lab data
No public lab test
Why this grade
Category baseline
food packaging is a category where PFAS exposure is more common.
Brand-stated PFAS-free
The brand states the product is PFAS-free (self-declared).
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
The container body is borosilicate glass, a high-silica formulation that resists thermal shock, chemical leaching, and degradation over time, making it one of the safest food contact materials available. The lid material is not publicly specified by Waste Free Pantry, which is a gap in transparency; typical food storage lids use polypropylene (PP) or silicone, each with different temperature and chemical resistance profiles. Borosilicate glass itself does not leach lead, cadmium, or BPA regardless of use conditions, but the seal (gasket or silicone ring) and lid polymer require verification to rule out off-gassing or migration.
The brand's record and disclosure
Waste Free Pantry markets itself as a PFAS-free brand and has made explicit claims about that commitment, which aligns with the glass container's inherent PFAS absence. However, the brand does not publicly disclose the specific material composition of the plastic lid, gasket, or internal seals on product pages or safety documentation reviewed in public sources. No recalls, safety violations, or adverse event reports are on record for this specific product line as of available public data.
How it compares in its category
Borosilicate glass containers are among the safest options in the food storage category, competing favorably with stainless steel (which is also inert) and superior to polycarbonate or standard plastic alternatives in terms of chemical stability and longevity. Glass containers do not degrade with repeated heating or exposure to acidic or fatty foods, unlike some plastic and ceramic coatings. The main trade-off is breakage risk and weight compared to plastic, but this is a durability, not a safety, issue.
If you buy it
Borosilicate glass is dishwasher-safe and oven-safe to high temperatures (typically 500F or higher), so normal kitchen use poses no chemical risk. The lid should not be microwaved if it is polypropylene; confirm with manufacturer or assume no microwave use of the lid. Inspect the seal or gasket annually for cracks, discoloration, or odor; if the seal degrads, replace it or retire the container. Store away from direct heat sources and avoid rapid temperature changes to prevent glass stress fractures.
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.”
Plastic lid composition and leaching risk
The specific polymer, stabilizers, and additives in the lid are not publicly disclosed by Waste Free Pantry. Without material confirmation, BPA, phthalates, or other polymeric additives cannot be ruled out, particularly if the lid is polypropylene and exposed to heat or prolonged contact with fatty foods.
Gasket or seal degradation and microbial colonization
Food storage containers with removable seals can harbor bacteria, mold, or biofilm if not cleaned thoroughly or if the seal material degrades and traps food particles. Borosilicate glass itself resists microbial growth, but silicone or rubber gaskets may support growth if stored damp or in warm conditions.
Glass thermal stress and breakage
Borosilicate glass is engineered to resist thermal shock, and no known safety hazard exists from normal use. However, rapid temperature changes (e.g., cold glass to hot oven) or impacts can cause fractures, creating sharp edges and potential ingestion of glass shards.
Lead or cadmium in glass formulation
Borosilicate glass does not use lead as a component and is not known to contain cadmium. Modern food-grade borosilicate is manufactured to exclude heavy metals, and no public record indicates contamination in this product line.
Off-gassing or VOC from plastic lid or seals
If the lid uses polypropylene or other thermoplastics, off-gassing of volatile organic compounds (VOCs) is possible, especially under warmth or extended storage. Manufacturer material data is needed to assess this risk for this specific product.
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.
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.