3 Sprouts Bento Box
Lower concern. Polypropylene material has no known PFAS association.
The bento box is made from polypropylene, a material not linked to PFAS. The brand has no PFAS statement on record. The silicone latch is not documented as water-repellent treated.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Polypropylene food container with silicone latch
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What 3 Sprouts Bento Box is made of, ingredients and materials
The 3 Sprouts Bento Box is polypropylene (PP), a thermoplastic polymer commonly used in food containers because it resists hydrolysis and does not contain BPA by default. The silicone latch is inert and food-safe at normal use temperatures. Polypropylene is not a material linked to PFAS concerns under normal conditions, though it can degrade if repeatedly heated above 100°C or exposed to aggressive solvents.
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 under use stress
Repeated thermal cycling, dishwasher exposure, or mechanical stress can cause microplastics to leach from degraded polypropylene, especially if lids are frequently opened under tension. Risk is low under normal use but increases with prolonged, aggressive handling.
Monomer leaching when heated
Polypropylene monomers can leach into fatty or acidic foods when the container is heated near or above its glass transition temperature (100°C). This risk is minimal at room temperature or with brief reheating but real if contents are kept hot in the sealed box.
Silicone latch degradation
Silicone latches can harden, crack, or become brittle over years of use, particularly with repeated heat exposure or UV light. This does not pose a direct food-safety risk but may result in loose seals and loss of container integrity.
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 is not formulated with BPA or BPS in standard food-contact applications. No recalls or test data suggesting BPA contamination in 3 Sprouts bento boxes.
Source, FDA ↗Phthalate plasticizers
Polypropylene does not require phthalate plasticizers; the material is inherently flexible and durable without them. This hazard is not relevant to rigid PP containers.
How is this PFAS grade calculated?
The brand's record and disclosure
3 Sprouts (owned by Sprout) has no documented recalls or safety controversies specific to this bento box model. The brand does not publicly disclose material sourcing, manufacturing certifications, or third-party testing results. No major regulatory actions or consumer complaints have been established in public records for this product line.
How it compares in its category
Polypropylene bento boxes present lower concern for rigid food storage compared to softer plastics (PVC, EVA) which carry phthalate risks. This product sits in the mainstream market segment; competitors like Rubbermaid and Bentgo use similar PP formulations with comparable safety profiles. Glass or stainless steel alternatives eliminate plastic hazards entirely but cost more and are breakable.
If you buy it
Do not heat contents above 100°C while sealed in the box; polypropylene begins softening around 130°C and may leach trace monomers if stressed by heat. Hand wash rather than dishwasher if possible to extend latch durability and avoid thermal stress cycling. Inspect the container regularly for stress cracks, cloudiness, or warping; replace if visible degradation appears, as this indicates potential microplastics shedding during use.
What is not known about PFAS in this product?
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Sprout has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to 3 Sprouts Bento Box?
- Plant-based fiber pulp (compostable)
- A third party reports verifying it as PFAS-free
- Microbe/mold growth if stored damp
2 hazards checked on this product, all on its full breakdown.
Eco-Products
Eco Products WorldView Compostable Take-Out Containers EP-SCRC32
- Plant-based fiber (compostable sugarcane bagasse)
- A third party reports verifying it as PFAS-free
- Bleaching agents and processing residues
3 hazards checked on this product, all on its full breakdown.
Eco-Products
WorldView Sugarcane Take-Out Containers
- Sugarcane bagasse (post-consumer fiber)
- A third party reports verifying it as PFAS-free
- Cellulose fiber degradation and food contact
2 hazards checked on this product, all on its full breakdown.
More food packaging 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.