Hydro Flask · Insulated Travel Mugs
Hydro Flask All Around Tumbler
Stainless steel core unlikely to contain PFAS.
Stainless steel with vacuum insulation and polymeric lid, no PFAS disclosures or third-party certifications found. Stainless steel carries minimal PFAS risk, but lid material stays unspecified.
The better-graded swap
Owala
Owala Stainless Steel Straw Tumbler Route 66
80/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Stainless steel exterior, vacuum insulation, plastic/polymeric lid
Lab data
No public lab test
What Hydro Flask All Around Tumbler is made of, ingredients and materials
The Hydro Flask All Around Tumbler uses 18/8 stainless steel as its primary beverage-contact surface, which is chemically inert and does not leach metals under normal use. The vacuum insulation layer between the inner and outer steel walls contains no known hazardous materials. The lid and sealing components are polymeric (typically polypropylene or similar), which carry microplastic and leaching risks only if heated or degraded, neither typical for a lid used at room temperature.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
Polymer lid leaching and microplastic
The polymeric lid may shed microplastics if degraded by heat, dishwasher stress, or age. Risk is low for cold or room-temperature beverages but rises if repeatedly exposed to boiling water or high-heat washing.
Vacuum seal degradation over time
The gasket and seal components (usually rubber or silicone) may degrade after extended use (2-5 years), leading to loss of insulation and potential bacterial growth in the gap if moisture enters. This is a durability issue rather than a direct chemical hazard.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Stainless steel coating or adhesive offgassing
High-grade 18/8 stainless steel does not offgas VOCs or toxic fumes under normal conditions. No reports of odor or health complaints linked to this product's metal construction.
BPA & bisphenols
Hydro Flask does not disclose the polymer type or additives in the lid. BPA-free claims are industry standard but not guaranteed by public statement; the risk is low for a non-food-storage plastic used at room temperature but unconfirmed by independent testing.
Source, FDA ↗The full breakdown
The brand's record and disclosure
Hydro Flask has published no detailed material safety data or third-party certifications (e.g., NSF, FDA clearance statements) for this product. The brand maintains silent public stance on PFAS sourcing and manufacturing standards. No recalls or health complaints specific to this tumbler model are on record. This silence is notable given industry peers like Klean Kanteen and S'well have made some transparency commitments.
How it compares in its category
This tumbler avoids the most common cookware/drinkware hazards, it has no ceramic glaze (no lead/cadmium risk), no Teflon-type coating nonstick coating (no fume risk), and no aluminum contact surface (no leaching risk). Among vacuum-insulated tumblers, it is typical in construction and safety profile. Glass-lined or borosilicate alternatives eliminate polymer lid concerns entirely but sacrifice durability and cost.
If you buy it
Keep the lid out of the dishwasher or high heat to prevent polymer degradation and microplastic shedding; hand wash it or replace it every 1-2 years if worn. Do not use boiling water repeatedly in the tumbler itself; the stainless steel can handle it, but extreme thermal shock may compromise the seal. The stainless steel core requires no special care and will not degrade under normal beverage use over years.
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
- Hydro Flask has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
Better-graded alternatives in Insulated Travel Mugs
Owala
FreeSip Sway Stainless Steel
- Stainless steel body, no interior coating disclosed
- Silicone and plastic lid/valve leachables
3 hazards checked on this product. See all of them.
Owala
Stainless Steel Straw Tumbler Route 66
- Stainless steel tumbler, bare uncoated
- Coating degradation and microplastic shedding from exterior print
3 hazards checked on this product. See all of them.
Thermos
18 oz. Icon Vacuum Insulated Stainless Steel Mug
- stainless steel exterior, vacuum insulation, stainless steel interior
- We found no PFAS statement from the brand
- Nickel leaching from stainless steel
3 hazards checked on this product. See all of them.
More insulated travel mugs 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.