PlanetBox Explorer Leakproof Lunchbox
Lower concern; stainless steel core unlikely PFAS source.
PlanetBox uses stainless steel construction, which is lower concern for PFAS. The plastic lid and seals are not disclosed; brand is silent on PFAS testing or treatments.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel container, plastic lid and gasket
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What PlanetBox Explorer Leakproof Lunchbox is made of, ingredients and materials
The PlanetBox Explorer uses a stainless steel container as its primary food-contact surface, which does not leach metals or degrade into food under normal use. The plastic lid and gasket (material composition not specified in public data) are secondary food-contact components that do not come into direct prolonged contact with hot food in typical lunchbox use. Stainless steel is chemically inert and resistant to corrosion, making it the lowest-concern material class for food storage containers.
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.
Microplastics
Plastic lid and gasket may shed particles over years of use if scratched, bent, or exposed to extreme temperature swings. Risk is reduced if the product is used only for cold/room-temperature food and not microwaved.
Source, EPA ↗Bacterial or mold growth in gasket seal
Leakproof gaskets create a closed environment where moisture and food residue can accumulate if the seal is not fully dried after washing. Proper cleaning and air-drying after each use mitigates this risk.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
BPA & bisphenols
No public test data or disclosure confirms or rules out BPA/BPS in the PlanetBox lid or gasket material. Stainless steel core is not a source of these compounds.
Source, FDA ↗Phthalates
Polymer type and additive package of the lid/gasket are not disclosed. Phthalate presence cannot be confirmed or excluded without manufacturer specification or independent testing.
Source, ATSDR ↗Stainless steel leaching (nickel/chromium)
Food-grade stainless steel (typically 18/8 or 304) does not leach metals under normal acidic or salt conditions in a lunchbox. No recalls or test reports suggest leaching from this product.
The full breakdown
The brand's record and disclosure
PlanetBox has not published detailed chemical disclosure statements or third-party certifications (e.g., FDA food contact confirmation, phthalate testing) in readily available sources. The brand maintains a general sustainability positioning but has not taken a public stance on PFAS or BPA use in components. No recalls or safety controversies specific to this model are on record in public databases.
How it compares in its category
Stainless steel lunchboxes are generally lower-concern than plastic-only or ceramic-lined alternatives, which may leach BPA, phthalates, or lead respectively. Many competitors in the leakproof lunchbox category also use plastic seals, but PlanetBox's stainless steel body avoids a common failure point of plastic containers that soften or warp. The lack of disclosed material specs for the lid/gasket is typical in this category but leaves uncertainty about polymer type and any additives.
If you buy it
Do not heat food inside the container or microwave the lid; use it for cold or room-temperature meals only. Inspect the plastic gasket periodically for cracks or discoloration; if visible degradation appears, replace it or discontinue use of that seal. Hand wash or follow the manufacturer's care instructions to avoid dishwasher damage to the gasket. Store dry to prevent bacterial or mold growth inside the lid seal.
What we don’t know
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Planetbox has made none
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.