Do Hydro Flask lunch boxes have PFAS?
Hydro Flask lunch boxes average 48 out of 100 on PFAS Authority's PFAS and toxin screen across the 6 Hydro Flask lunch boxes graded as of October 2026, below the 70 out of 100 median for the 43 other lunch boxes brands graded alongside it.
Hydro Flask lunch boxes average Poor on our four-band scale. 3 of the 6 we graded are worth buying.
PFAS Authority is a scoring system, not a laboratory. We do not test products ourselves. Grades are model-based, built from published ingredients, materials, certifications, brand disclosures and third-party lab results where they exist. See the rubric.
What Hydro Flask says and does about PFAS
Hydro Flask does not publish a PFAS policy that we could find. In February 2024, during the controversy over lead in other brands’ tumblers, Cycling Weekly reported that Hydro Flask had said its bottles contain no lead, BPA, phthalates, heavy metals or PFAS. We could not locate that statement on Hydro Flask’s own channels, and we found no independent lab test of its products for PFAS.
- Brand statementCycling Weekly reported in February 2024 that Hydro Flask had released a statement saying its bottles contain no lead, BPA, phthalates, heavy metals or PFAS. Cycling Weekly ↗
- Brand statementHydro Flask’s own post that same week, as quoted by Gizmodo, said it had not used lead in its sealing process for over a decade, and did not mention PFAS. Gizmodo ↗
Sources checked September 14, 2026. A brand statement is the company’s own claim, which we report but have not verified. Our grades are model-based estimates, not lab tests.
Hydro Flask lunch boxes worth buying Good or better, best-graded first
Hydro Flask
Carry Out Lunch Box
- stainless steel exterior, plastic/polypropylene interior
- Bacterial or mold growth in seals and gaskets, Insulated lunch boxes with multiple seals and compartments can…
2 hazards checked on this product. See all of them.
Hydro Flask
Carryout Lunch Rolltop
- Nylon fabric, polyester lining, plastic hardware
- Polyester microplastic shedding from lining, Polyester linings can shed fibers when abraded by ice packs…
2 hazards checked on this product. See all of them.
Hydro Flask
Kids Insulated Lunch Box
- stainless steel body, plastic lid and lining
- BPA & bisphenols, The plastic components (lid, interior lining) are not identified by published material name…
3 hazards checked on this product. See all of them.
Graded and flagged Poor and Bad, we’d swap these
Hydro Flask
Carryout Lunch Tote
- Recycled polyester exterior, waterproof-treated lining
- PFAS, Waterproof fabric finishes on insulated totes historically use C6 or C8 PFAS compounds. Hydro Flask…
4 hazards checked on this product. See all of them.
Hydro Flask
Insulated Lunch Bag
- neoprene-lined polyester exterior with waterproof backing
- PFAS, The neoprene and polyester materials are low-risk, but the waterproof backing likely uses either…
3 hazards checked on this product. See all of them.
Hydro Flask
Carryout Lunch Bag
- Nylon/polyester outer with unspecified water-resistant finish
- Phthalates, Polyester in the blend may contain residual phthalates from manufacturing; no third-party testing…
4 hazards checked on this product. See all of them.
Better lunch boxes from other brands
Graded higher than the Hydro Flask average of 48.
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.
The same question, asked of the other lunch boxes brands
Best average grade first. Hydro Flask averages 48.
See every Hydro Flask product we grade on the Hydro Flask brand page, or the full lunch boxes ranking.