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Hydro Flask

Hydro Flask Water Bottle - Insulated Stainless Steel - Non Spill, Leakproof in 21 Oz Stone

Based on 13,629 reviews
Condition: New
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$30.05
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Availability: Only 3 left in stock, order soon!
Fulfilled by Amazon
Arrives Friday, Oct 30
Order within 22 hours and 50 minutes

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At a glance

Condition
New
Style
21 Oz
Color
Stone
Model
S21SX010
Capacity
21 fl oz
Weight
23.68 g
Material
Stainless Steel
In the box
Lid

Features 10

  • 24 hours cold, 12 hours hot
  • TempShield double-wall vacuum insulation
  • Leakproof when closed
  • Pure taste, no flavor transfer

Description

Stainless steel, cupholder compatible, fits anywhere—the compact, reusable, refillable Standard Mouth insulated water bottle keeps cold drinks cold for 24 hours, hot drinks hot for up to 12 hours, and holds enough hydration for quick adventures.

Specs 29

Brand Hydro Flask
Capacity 21 Fluid Ounces
Color Stone
Recommended Uses For Product Water
Special Feature TempShield™ insulation, Proprietary Powder Coat
Brand Name Hydro Flask
Age Range Description Adult
Model Name Standard Mouth Flex Cap Bottle

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Oct 30

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

Love hydroflask! Great quality even with daily use
Style: 24 Oz Color: Indigo
My husband loves hydroflask and he needed one that seals well and travels easy. This worked perfectly. It fits in any cup holder we've encountered and the top hasn't leaks on him so far. It gets daily use so the lid quality seems good. The color is true to the photos. His water stays cold all day and even longer. The handle on the lid means he can comfortably attach it to his backpack too. ... show more
Reviewed in the United States on January 1, 2026 by Kady
Reliable Hydration Bottle
Style: 21 Oz Color: Trillium
I’ve been using Hydroflask since the release. I believe it was 2009 when I purchased my first bottle. Hydroflask has gone through quite a few changes, design wise, changing ownership and adding products. It’s still my go-to hydration bottle. There are probably other bottles on the market equal to Hydroflask but it’s a brand I have found to be reliable. My water stays cold, it doesn’t leak and it can take an occasional drop. The 21oz fit easily into my bag and isn’t to heavy to carry if I’m holding it. I like the matte finish so it isn’t slippery in the hands. The lid quality is good and the handle is easy to grip and hold. A bottle brush fits easily into the bottle for cleaning and the “O” ring on the lid can be removed to scrub it and keep it from getting gross. Overall I highly recommended Hydroflask products. ... show more
Reviewed in the United States on October 26, 2025 by desert lady
Perfect bottle
Style: 21 Oz Color: Sandpiper
Nicely packaged to prevent any denting. Water bottle is a nice color and will replace my 6 year old Hydro Flask. I love it that these bottles aren’t too heavy, yet they keep items nice and cold. They also are the perfect size for cup holders.
Reviewed in the United States on January 20, 2026 by Mama P
The best water bottle
Style: 21 Oz Color: SURF
The best water bottle - machine washable, easy to carry, keeps my beverage ice cold.
Reviewed in the United States on March 17, 2026 by Karen H.
Nice basic flask
Style: 21 Oz Color: SURF
I've purchased this multiple times in various colors. Nothing fancy, just sturdy, stainless, leak proof and insulating.
Reviewed in the United States on March 18, 2026 by James
Beautiful design, great color, keeps drink cool, beware of shipping damages
Style: 24 Oz Color: Stone
I ordered 2 bottles in same color. First one arrived nicely but second one arrived dented so I had to return it. The following review is for the first bottle which arrived in good condition. I would give 5 starts but considering the second purchase, I give 4 stars since it was expensive but damaged. Gladly I could return it for free thanks to Amazon. I love this water bottle for its design and quality. Other bottles look super clunky and look like they are designed to be taken on an expedition though the woods. I use this every day for school and I love it. One drawback however is that the 24oz is not enough for me. I didn’t want to buy the 32oz version since it is very large, I went for the 24oz because it is slim and tall and fits in my bag. I wish they had a slim version of 32 oz one. Regardless, I am able to get through 1/2 of my day on 24oz then I have to refill a few times. Otherwise I love this bottle and can see it lasting me a very long time. One other thing to note is that it seems susceptible to dings and scratches, especially on darker colors. I would recommend buying the hydro flask bottle boot for protection and noise reduction when setting down. ... show more
Reviewed in the United States on August 29, 2023 by Arman Bekzatyan
Keeps beverages ice cold for a long time!
Style: 24 Oz Color: Trillium
My family uses these Hydro Flasks all the time and I've seen how sturdy they are, how they keep things cold a very long time, and how they've held up over time, even with frequent dishwasher washing. I have not used these for hot beverages, so I can't speak to that, but I've seen the ice in the water be there all day and still be there the next morning, so yes, they keep things cold a long time. I was able to snag this pink one for just over $18, which is a bargain and I'm quite happy about that. I like the slim design - it fits in my car's cup holder very easily. The top is very small and slim too, which is great for when I'm working out and I want a quick gulp or gulps of water. There's no pouring out of water on the sides since it is so slim, if I am really tipping it up to drink a lot. No leaking - these Hydro Flasks have been very good about being leak resistant. The pink color is very subtle - this isn't a bright pink, which is what I was looking for - well, actually, I just picked it because it was on the best sale - any color would have done as I didn't care. But if you like pink, note that this is a very pale pink. It has a handle for carrying, which I appreciate. So happy I ordered it - very happy I waited until it went on sale! ... show more
Reviewed in the United States on February 7, 2026 by Kathryn Magendie
Durable and looks nice.
Style: 21 Oz Color: Indigo
Just the right size and it keeps my water cold.
Reviewed in the United States on March 8, 2026 by Maurice Collins
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