Products · Water bottles & drinkware · Hydro Flask

Hydro Flask 32 oz Wide Mouth Insulated Water Bottle with Flex Cap

An insulated 32 oz steel bottle you drink from at the steel rim. The cap is plastic (type not named) and the outside is powder coated. Lead Safe Mama's X-ray tests find Hydro Flask's insulated bottles lead-free since about 2017.

Best for Cold or hot water all day when you want insulation and want to avoid the leaded sealing dots found in many other insulated bottles.

Our rating: Fair (3.4 of 5)
Price range: Premium
Size: 32 oz, double wall, 3.55 in wide, 11 in tall, 0.97 lb empty, wide mouth that takes ice cubes
Made in: Not stated on the product page. Mamavation lists Hydro Flask's wide-mouth bottles as made in China and Oregon.

approx. $45 for the 32 oz bottle with its Flex Cap

See it on Hydro Flask’s site → (opens in a new tab)

We are not affiliated with Hydro Flask. This link goes to the maker’s own page, with no tracking code. How we're funded.

Also sold at Amazon ($45), EarthHero ($45), Walmart ($40) .

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How we evaluated it

How it scores Our rating, metric by metric Fair, 3.4 of 5

What touches your drink 45% of the rating 3 of 5

Steel inside and a steel rim to drink from, but the cap is an unnamed plastic that touches the water when carried and the outside is an unnamed powder coat.
Independent testing 20% of the rating 4 of 5

Lead Safe Mama's X-ray tests found a lead sealing dot in a pre-2013 bottle and none in 2017 and later ones; no result is published for this exact bottle.
Durability 15% of the rating 4 of 5

A limited lifetime warranty against defects and caps sold for about $10, though the vacuum can fail and warranty claims go through authorized dealers.
Trust 10% of the rating 4 of 5

Publishes a lead statement and a California AB 1200 materials list and has no recall or Prop 65 notice, but does not name its cap plastic or coating.
Value 10% of the rating 2 of 5

$44.95 for 32 oz is about $1.40 an ounce, the most here; a plain 40 oz steel bottle costs about $0.80 an ounce.

The rating, 3.4 of 5, is the weighted average of these scores. See how we rank water bottles & drinkware and our standard.

Where to buy Stores and the prices we saw 3 stores

Amazon (opens in a new tab) approx. $45. The 32 oz Wide Mouth Flex Cap in Harbor Blue. Amazon.com itself offers it at $44.95, shown under Another way to buy; the featured offer on 2026-11-03 was $42.95 from a third-party seller (Justclick llc), shipped by Amazon. Opened 2026-11-03.
EarthHero (opens in a new tab) approx. $45. Wide Mouth Water Bottle 32oz in Black, Stone, White or Agave at $44.95, fulfilled and shipped by EarthHero from its own warehouse. The listing does not name the cap; opened 2026-11-03.
Walmart (opens in a new tab) approx. $40. Hydro Flask Wide Mouth with Flex Cap, 32 oz in red, at $40.40, sold by Prime Online Brands, a marketplace seller. Hydro Flask's warranty covers only authorized dealers and we could not tell whether this seller is one; opened 2026-11-03.

Prices as we saw them on November 3, 2026. They change often. These links carry no tracking code and earn us nothing.

What it’s made of What touches your food, water, skin or air 4 materials

Body: stainless steel with double-wall TempShield vacuum insulation; the maker's product page does not give the grade, though retailer listings that repeat its copy say 18/8 pro-grade steel
Vacuum seal: sealed without lead since 2012, per the maker; the sealing material is not named
Wide Mouth Flex Cap: a BPA-free screw-off cap with stainless steel pivots and a flexible strap; the plastic and the gasket are not named (only the Stainless-color cap is described as 18/8 steel), and you drink from the steel rim with the cap off
Outside: powder coat the maker does not name, dishwasher safe per the maker

Who tested it What each test found, and who paid for it 6 tests

Independent Lead Safe Mama, LLC (independent advocate; earns Amazon affiliate income) November 2017

X-ray (XRF) readings for two bottles: the sealing dot of an older orange Hydro Flask (pre-2013) held 177,500 ppm lead, and a newer green one tested in August 2017 was lead-free. Open ↗ (opens in a new tab)
Independent Lead Safe Mama, LLC (independent advocate; earns Amazon affiliate income) January 2024

Its guide, updated January 2024, says pre-2017 Hydro Flask insulated bottles may have a leaded sealing dot and that all post-2017 insulated Hydro Flask products it has tested have been consistently lead-free. It does not publish a result for this bottle. Open ↗ (opens in a new tab)
Independent Lead Safe Mama, LLC (independent advocate; earns Amazon affiliate income) February 2026

Its February 2026 water bottle list says Hydro Flask and Owala are the only insulated steel brands it has found consistently lead-free over a decade, and that any model from them will be. Open ↗ (opens in a new tab)
Independent Lead Safe Mama, LLC (independent advocate; earns Amazon affiliate income) July 2024

Its July 2024 Prime Day post lists a Hydro Flask insulated bottle (the Amazon link is the 40 oz Wide Flex, the same family as this one) among 'confirmed lead-free products' it says it tested with XRF in all components. No figures are given. Open ↗ (opens in a new tab)
Independent Mamavation (a desk review of 180+ bottles from public information, not a lab test; earns affiliate income) April 2025

Lists the Hydro Flask Wide Mouth with Flex Straw Cap (a different cap from this bottle's Flex Cap) among its best stainless steel bottles with coatings, and puts the Oasis, which has a plastic spout, in its second tier. It says bottles from before 2013 have been tied to lead sealing dots and advises against putting coated bottles in the dishwasher, which Hydro Flask's own care FAQ allows for its powder-coated bottles. Open ↗ (opens in a new tab)
Maker’s own test Hydro Flask (its California AB 1200 materials disclosure; no date shown)

For its Wide Flex Cap style it lists chromium compounds, total chromium, iron, manganese and nickel (compounds and metallic) as intentionally added listed chemicals; molybdenum appears only for its shaker bottle. No lead, cadmium or PFAS is listed, and it says its nickel items comply with Prop 65. Open ↗ (opens in a new tab)

Who paid, and why it matters

Independent The tester took no money from the maker for it: a consumer group, a journalist, a university or a regulator.
Paid certification An outside lab or certifier tested or listed it, and the maker paid for that.
Maker’s own test A lab report or certificate of analysis the maker commissioned and published.

A certification is a floor, not a verdict: it checks what its program checks and nothing else. We weigh tests by someone with no stake in the result most.

What people ask Worries raised online and elsewhere, and what we found 7 questions

Is there lead in the base? Older Hydro Flasks did.: Yes in old ones. Lead Safe Mama read 177,500 ppm lead in the sealing dot of a pre-2013 bottle and found a 2017 bottle clean (post (opens in a new tab)). The maker says it moved to a lead-free seal in 2012 (FAQ (opens in a new tab)), and Lead Safe Mama says its bottles since 2017 have tested lead-free (guide (opens in a new tab)). The switch date is not clear-cut: a reader's comment on the first post (opens in a new tab) said in 2018 that Hydro Flask had told them it stopped using lead in August 2013. Check the age of any hand-me-down.
Is the plastic cap a problem?: You drink from the steel rim once the screw-off cap is off, but the cap's underside touches the water when you carry it. Hydro Flask calls the cap BPA-free and names neither the plastic nor the gasket (cap page (opens in a new tab)); the page says only the Stainless-color cap is made with 18/8 steel (and calls it an insulated cap), so we could not confirm what the other colors or the cap's inside are made of. Mamavation calls a screw-top lid the safest kind (guide (opens in a new tab)). Skip the straw and chug caps sold for the same bottle: they are plastic spouts, and Hydro Flask's own FAQ (opens in a new tab) says the straw cap and straw are different plastics.
What is the colored coating, and is it PFAS?: Hydro Flask says powder-coated bottles are dishwasher safe (care FAQ (opens in a new tab)) but does not name the coating, and its AB 1200 list (opens in a new tab) shows only steel elements. Mamavation says most bottle powder coats are polyester, polyurethane, acrylic or epoxy and advises against the dishwasher. We found no PFAS test of it.
Does the brand's lead-free marketing count, given it came during the Stanley controversy?: Hydro Flask posted on Instagram in early 2024 that it does not use lead in its sealing, and The Takeout described such posts by Hydro Flask and Owala as self-promotion and did not verify them (article (opens in a new tab)). Our evidence is Lead Safe Mama's tests, which are independent but come from a site that earns Amazon affiliate income and links Hydro Flask bottles.
Does stainless steel leach nickel into water?: Little does into plain water. Our water bottle guide found low metal release in lab tests, while acid raises it: a 2026 case report (opens in a new tab) tied a nickel skin reaction to a steel bottle holding a citric acid solution.
Has Hydro Flask had a recall, a Prop 65 notice or a lawsuit?: We found no CPSC recall under its name (CPSC search (opens in a new tab)), no Prop 65 notice naming it (California AG search (opens in a new tab)). A web search found no class action over its bottles; the lead class actions it turned up named other brands, such as Stanley and Bindle.
Will the warranty cover a bottle from a marketplace seller?: Possibly not. Hydro Flask accepts claims only for products bought from an authorized dealer and may ask for proof of purchase (warranty (opens in a new tab)). We found no list of authorized dealers. Amazon.com offers the bottle itself, EarthHero ships from its own warehouse, and the cheaper Walmart and Amazon featured offers are third-party sellers, so ask before relying on the warranty.

Why we chose it What put it on our list 3 points

It is an insulated bottle with a record of clean results for lead: Lead Safe Mama's X-ray tests found a leaded sealing dot in a pre-2013 bottle and none in 2017 and later ones, and the maker says it dropped lead from its seal in 2012.
You drink from the steel rim of a wide mouth, not through a plastic spout, once the cap is off.
Its California AB 1200 list names only steel elements, with no lead, cadmium or PFAS, and it carries a limited lifetime warranty with replacement caps at about $10.

Trade-offs What to weigh before you buy 5 points

The cap is plastic and its type is not named; the straw and chug caps Hydro Flask sells for this bottle are plastic spouts you drink through, which we would not buy.
The outside is a powder coat the maker does not name, and we found no PFAS test of it.
About $1.40 an ounce, the highest here; a plain steel bottle costs far less.
No result is published for this exact bottle, and bottles made before about 2017 may still have a lead dot.
Warranty claims go through authorized dealers, and you must ship the bottle back for review before a replacement (a broken cap is the exception).

What to know Details worth knowing first

Hydro Flask is one of only two insulated brands Lead Safe Mama has found lead-free over many years. In 2017 it published X-ray readings for two bottles: the sealing dot on a pre-2013 Hydro Flask held 177,500 ppm lead, and a 2017 bottle had none. The maker says it stopped using lead in its vacuum seal in 2012. The other brand is Owala, but you drink from an Owala through a plastic spout and straw, which is why Hydro Flask is the only insulated brand on our list.

We chose the wide-mouth bottle with the plain Flex Cap because you drink from the steel rim. The cap itself is plastic with a strap, and Hydro Flask does not name the plastic, so that costs points. The straw and chug caps it sells for the same bottle are spouts you drink through, and we would skip them. The outside is powder coated with a finish the maker does not name.

It is the priciest drinkware on our list, at about $1.40 an ounce. If you do not need insulation, the steel Klean Kanteens do the job for less with no plastic in the cap. If you are handed an old Hydro Flask, check its age, because bottles from before about 2017 may have a lead dot.

What we checked Each claim, and how sure we are of it 6 checks

How Hydro Flask 32 oz Wide Mouth Insulated Water Bottle with Flex Cap measures up against our water bottles & drinkware criteria
What we checked	What we found
Steel or glass inside Maker’s claim	Stainless steel, double wall. The maker's product page gives no grade; retailer listings say 18/8 pro-grade steel, and the maker's cap page says its Stainless-color cap is 18/8.
Lids that keep plastic away Not verified	A BPA-free screw-off Flex Cap with a strap; the plastic and gasket are not named. You drink from the steel rim with it off.
No lead where you can touch it Verified	The maker says its seal has been lead-free since 2012. Lead Safe Mama found 177,500 ppm lead in a pre-2013 bottle's dot and none in 2017 and later bottles (2017, 2024, 2026).
Built to last Maker’s claim	Limited lifetime warranty against defects (authorized dealers only); caps are sold for about $10.
Materials disclosure Maker’s claim	Hydro Flask's California AB 1200 list shows chromium, iron, manganese and nickel only for the Wide Flex Cap style; it says its nickel items comply with Prop 65.
Recalls and notices Verified	No CPSC recall under the Hydro Flask name and no Prop 65 notice naming it (searched 2026-11-03).

What the labels mean

Verified We opened an independent record that confirms it: a certifier’s listing, a regulator’s list or a lab report. It is linked under Sources.
Maker’s claim The maker says so on its own page or label. We read it but found no independent record.
Not verified We looked and could not confirm it, or the maker does not say. Treat it as unknown.

Sources Where our facts come from 16 sources

Hydro Flask: 32 oz Wide Mouth. Maker’s page. Price, size, features and specifications, read 2026-11-03. Open ↗ (opens in a new tab)
Hydro Flask: Wide Mouth Flex Cap. Maker’s page. Cap description: BPA-free, steel pivots, strap, 18/8 steel in the stainless color, $9.95. Open ↗ (opens in a new tab)
Hydro Flask FAQ: Does Hydro Flask use lead for sealing its bottles and tumblers?. Maker’s page. Says it moved to a lead-free sealing process in 2012. Open ↗ (opens in a new tab)
Hydro Flask FAQ: Product warranty. Maker’s page. Open ↗ (opens in a new tab)
Hydro Flask FAQ: Care and cleaning. Maker’s page. Powder-coated bottles are dishwasher safe; mugs are not powder coated. Open ↗ (opens in a new tab)
Hydro Flask FAQ: Can the Wide Mouth Straw Lid be used for hot coffee and tea?. Maker’s page. Says the straw cap and its straw are made from different plastics. Open ↗ (opens in a new tab)
Hydro Flask: California AB 1200 required materials disclosure. Maker’s page. A list of intentionally added chemicals from state lists, by product style. Open ↗ (opens in a new tab)
Lead Safe Mama: A tale of two Hydro Flasks, leaded and not (2017). Test report. XRF screening by an independent advocate who earns Amazon affiliate income. Open ↗ (opens in a new tab)
Lead Safe Mama: Which water bottles and sippy cups are lead-free? (updated January 2024). Test report. Open ↗ (opens in a new tab)
Lead Safe Mama: Lead-Free Water Bottles (updated February 2026). Test report. Open ↗ (opens in a new tab)
Lead Safe Mama: Amazon Prime Day 2024, lead-free choices. Test report. A shopping post with Amazon affiliate links; it lists a Hydro Flask 40 oz Wide Flex Cap bottle as confirmed lead-free. Open ↗ (opens in a new tab)
Mamavation: Best and worst reusable water bottles (April 2025). Test report. A materials review from public information, not a lab test; the site earns affiliate income. Open ↗ (opens in a new tab)
The Takeout: Feud, Stanley vs. Hydro Flask (February 2024). Independent source. Reports the brands' own lead statements and does not verify them. Open ↗ (opens in a new tab)
CPSC recall search for Hydro Flask, run 2026-11-03. Certifier or regulator listing. No recalls. Open ↗ (opens in a new tab)
California Attorney General: Prop 65 60-day notice search. Certifier or regulator listing. Searched by alleged violator on 2026-11-03; nothing named Hydro Flask. Open ↗ (opens in a new tab)
Hayakawa and Watanabe-Okada 2026: nickel leaching from a stainless steel bottle holding citric acid (PubMed). Test report. Open ↗ (opens in a new tab)

Alternatives Other options to compare 3 options

Klean Kanteen Wide 40 oz with Wide Loop Cap Not insulated, with a steel-lined cap, about $32.
Klean Kanteen Reflect 27 oz with Bamboo Cap No paint or plastic anywhere, not insulated, about $33.
Lifefactory 22 oz Glass Water Bottle Glass with a plastic screw cap, about $18.

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