Decathlon Sac Isotherme Lunch Box Sac Isotherme Decathlon
Lower concern; standard insulated lunch box with no known PFAS risks.
Decathlon's isothermal lunch box uses common PE and polyester materials typical of food-contact cooler bags. No brand disclosure on PFAS or waterproofing chemistry; no lab data available.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Polyethylene (PE) outer, polyester lining, insulation
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What Decathlon Sac Isotherme Lunch Box Sac is made of, ingredients and materials
This lunch box uses polyethylene (PE) as the outer shell and polyester as the lining, with foam or similar insulation between them. PE is a stable, non-reactive plastic commonly used in food contact applications and does not leach BPA, BPS, or phthalates under normal use. Polyester lining is chemically inert when used as a food barrier and does not off-gas significant volatile compounds at ambient temperatures. The insulation layer is typically polyurethane foam or similar, which poses no known hazard when intact and not heated directly.
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
PE and polyester surfaces may shed fine particles if scratched, compressed repeatedly, or exposed to UV light over years of use. Risk is low under normal storage and handling; replace if visible wear appears on the lining.
Source, EPA ↗Mold or bacterial growth in insulation
If the polyester lining tears or the seal is compromised, moisture can enter the insulation foam and promote mold growth. This is a use and maintenance issue, not a material hazard; ensure the lining stays intact and the box dries completely after washing.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
BPA & bisphenols
PE and polyester do not contain or leach BPA or BPS. No reported incidents or concerns for this product or material class.
Source, FDA ↗Phthalates
PE and polyester are not plasticizers and do not rely on phthalate additives. No known risk with this lunch box material composition.
Source, ATSDR ↗Foam insulation breakdown and off-gassing
Polyurethane or similar foam insulation does not off-gas volatile organic compounds (VOCs) at room temperature or under normal use. Risk emerges only if foam is directly exposed to heat above 80°C or crushed/damaged, which allows dust inhalation; avoid compressing or heating.
The full breakdown
The brand's record and disclosure
Decathlon has no documented recalls or safety incidents involving this lunch box or similar soft-sided food containers. The brand has not published detailed chemical disclosures for this product, but Decathlon's EU-market food contact items are subject to EU Regulation 10/2011 compliance verification. No lawsuits, regulatory warnings, or third-party test failures are on record for this product line. Decathlon's general transparency on chemical content is moderate; they do not prominently advertise independent certifications like BPA-free labeling, though compliance with food contact standards is legally required.
How it compares in its category
Soft-sided insulated lunch boxes in PE/polyester construction are standard across budget and mid-tier brands (Decathlon, Monbento, Lunch Bots, and store brands). This design is lower chemical risk than rigid plastic containers with pigmented or metallic coatings, or vintage stainless steel models with epoxy-lined interiors. PE and polyester materials have no known association with microplastic shedding into food at room temperature, unlike some silicone or melamine alternatives under stress or UV exposure. Decathlon's version is competitively positioned; no evidence suggests elevated leaching or off-gassing compared to similar products in this price range.
If you buy it
Keep this lunch box out of direct sunlight and do not store it at temperatures above 50°C (122°F); PE softens and polyester coatings can degrade if exposed to high heat. Do not use for hot foods (above 60°C); the insulation and PE exterior are not designed for sustained heat exposure. Wipe the interior lining with mild soap and water after each use; do not soak or run through hot dishwasher cycles, as the seal integrity and foam insulation can be compromised. Replace if the exterior cracks, the lining tears, or the foam begins to break down, as these allow moisture ingress and reduce cooling performance.
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
- Decathlon has made none
Formulations change between production runs, so check the current label. How we grade.
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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.