Prep Naturals · Food Storage Containers
Prepnaturals 5 Pack 34 Oz Glass Meal Prep Containers - Dishwasher Microwave Freezer Oven Safe Storage With Lids (multi-compartment), Clear
Lower-concern option; glass containers themselves pose minimal PFAS risk, but plastic lids warrant caution.
Glass meal prep containers are inherently lower-concern for PFAS compared to nonstick or treated cookware. However, the plastic lids and seals are the weak point, Prep Naturals provides no public disclosure about lid material or manufacturing.
Shop Prep Naturals on Amazon →Material
borosilicate glass 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
Borosilicate glass is chemically inert and does not leach into food under normal use, making it one of the safest food storage materials available. The plastic lids are the functional weak point, typically made from polypropylene (PP) or other polymers that can degrade, warp, or release chemicals if exposed to high heat or prolonged contact with acidic foods. The multi-compartment design means lids bear more stress and sealing pressure, potentially accelerating degradation at contact points.
The brand's record and disclosure
Prep Naturals maintains no publicly available safety certifications or third-party testing disclosures for these containers. The brand has not issued statements on PFAS use in lid materials or manufacturing processes, which is standard silence from this market segment but leaves a transparency gap. No recalls or documented safety incidents for this specific SKU are on record as of available sources.
How it compares in its category
Glass meal prep containers are among the safest options in the food storage category because glass itself poses no leaching hazard. Most competitors in this price range (budget glass container sets) use similar borosilicate glass bodies with plastic lids of unknown composition, so Prep Naturals is typical, not exceptional. All-glass lids would eliminate the plastic hazard but are rare and significantly more expensive.
If you buy it
Wash lids by hand and avoid placing them in the dishwasher's hot zone if possible, as repeated high-heat cycling accelerates plastic degradation. Do not use these containers in the oven if lids are attached; remove lids before heating to 350°F or above. Replace lids every 2-3 years or sooner if you notice cloudiness, cracks, or warping. Avoid storing acidic foods (citrus, vinegar-based dressings) in contact with plastic lids for extended periods.
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 degradation and leaching
Plastic lids can warp, crack, or degrade over time with heat and wear, potentially releasing polymer fragments or residual monomers into food. Material composition of lids is not disclosed by the brand.
BPA/BPS in plastic lids
No testing or recalls indicate BPA or BPS presence in Prep Naturals lids, but polypropylene lids may contain other plasticizers not fully characterized; brand makes no claim of BPA-free status.
Borosilicate glass breakage and thermal shock
Borosilicate glass is thermal-shock resistant by design, but corner edges and compartment walls may still chip or shatter under extreme temperature changes or drops. No specific fragility reports exist for this brand.
Microplastic shedding from lids during use
Repeated washing, stacking, and flexing of plastic lids can cause microscopic particles to break free, potentially contaminating food over time. Risk increases with age and dishwasher use.
Seal failure and food spoilage
Lid degradation compromises sealing integrity, allowing air ingress and bacterial growth over time. Multi-compartment lids have more sealing points and may fail sooner than single-compartment designs.
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.