Oxo Prep & Go Sandwich Container
Lower-concern food container, but no PFAS transparency from brand.
OXO Prep & Go uses standard polypropylene plastic, which has low inherent PFAS risk. Brand provides no PFAS disclosure or certification, limiting confidence.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Plastic (polypropylene), silicone gasket
Lab data
No public lab test
What Oxo Prep & Go Sandwich Container is made of, ingredients and materials
This container is injection-molded polypropylene (PP), a thermoplastic chosen for food contact because it resists moisture, does not easily leach at ambient temperatures, and has a higher melting point than polystyrene or polyethylene terephthalate. The silicone gasket seals the lid and creates an airtight compartment; silicone is inert and does not off-gas volatile organics under normal use. Polypropylene's main chemical vulnerability is heat, prolonged exposure above 100 degrees Celsius or microwave heating can degrade the polymer backbone and potentially increase leaching, though the risk remains low for brief heating or room-temperature storage.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Microplastic shedding when heated or degraded
Polypropylene is stable at room temperature and refrigeration but can degrade or fragment if overheated, microwaved at high power, or exposed to sustained UV light; normal storage and hand-washing pose minimal risk, but repeated thermal stress may eventually produce particles.
Leaching of residual monomers or processing additives
All polypropylene contains trace amounts of unreacted propylene and slip agents or UV stabilizers; migration into food is negligible at ambient temperature but increases with heat, though absolute levels remain below regulatory concern thresholds for short-term use.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
BPA & bisphenols
Polypropylene does not require BPA or BPS as plasticizers or hardening agents by design; no additive BPA or BPS is on record in OXO's food-storage line.
Source, FDA ↗Phthalates
Polypropylene does not use phthalate plasticizers; this hazard is not relevant to rigidly molded PP containers.
Source, ATSDR ↗Silicone gasket degradation or off-gassing
Food-grade silicone does not off-gas volatile organics or degrade under normal food storage; no documented incidents with OXO silicone gaskets are on record.
The full breakdown
The brand's record and disclosure
OXO has no public recalls or safety advisories specific to this sandwich container on record. The brand does not publish comprehensive material safety data sheets or PFAS transparency statements for food-storage products, which is typical of kitchenware manufacturers but limits independent verification. OXO maintains ISO 9001 quality certification and complies with FDA food-contact regulations; no established controversies regarding this product line are documented.
How it compares in its category
Polypropylene containers are mid-range in food-storage safety, they avoid BPA and phthalates (common in older polycarbonate or PVC products) and do not break into microplastics as readily as thin polyethylene. Glass or stainless-steel containers eliminate plastic leaching altogether but are heavier and more fragile. This OXO model sits at the standard tier for plastic lunch boxes, with no documented material or manufacturing advantages over similar PP competitors, but also no known disadvantages.
If you buy it
Do not microwave the container at high power or for extended periods; instead, transfer food to glass or ceramic for heating. Store at room temperature or refrigerated; avoid direct sunlight, which can degrade polypropylene over years. Replace the silicone gasket if it becomes cracked, discolored, or no longer seals tightly, as compromised seals can allow air ingress and food spoilage rather than material degradation. Hand-wash rather than run through a heated dishwasher cycle to extend container life and avoid unnecessary polymer stress.
What we don’t know
- Basis
- Model estimate, 70% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- OXO has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
Better-graded alternatives in Lunch Boxes
Klean Kanteen
Double Wall Vacuum Insulated Stainless Steel Food Canister Container with Leak Proof Lid
- Stainless steel body, silicone gasket lid seal
- The brand calls it PFAS-free, which we have not verified
- Silicone gasket degradation
3 hazards checked on this product. See all of them.
Snapware
Meal Box Glass
- borosilicate glass
- We found no PFAS statement from the brand
- Leaching from glass matrix or lid seals
2 hazards checked on this product. See all of them.
OXO
Steel Pop Big Square Short - 2.8 Qt/2.6 l
- Stainless steel container, no surface treatment
- Lid/gasket polymer leaching
3 hazards checked on this product. See all of them.
More lunch boxes 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.