Hydro Flask Water Bottle - Insulated Stainless Steel - Non Spill, Leakproof in 21 Oz Stone
Condition: New
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Availability:
In Stock.
Arrives
Thursday, Mar 12
Style: 21 Oz
Color: Stone
Features
- 24 hours cold, 12 hours hot
- TempShield double-wall vacuum insulation
- Leakproof when closed
- Pure taste, no flavor transfer
- Durable stainless steel
- BPA-Free
- Dishwasher safe
- Not for use on a stove, in a microwave or freezer
- Keep hot liquids out of the reach of children
- water bottle, leakproof, insulated, 24 hours cold, 12 hours hot, dishwasher safe, 21 oz, cupholder compatible
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.
Brand: Hydro Flask
Capacity: 21 Fluid Ounces
Color: Stone
Recommended Uses For Product: Water
Special Feature: TempShield™ insulation, Proprietary Powder Coat
Brand: Hydro Flask
Capacity: 21 Fluid Ounces
Color: Stone
Recommended Uses For Product: Water
Special Feature: TempShield™ insulation, Proprietary Powder Coat
Age Range (Description): Adult
Product Dimensions: 1.12"W x 4.37"H
Model Name: Standard Mouth Flex Cap Bottle
Item Weight: 0.05 Pounds
Material: Stainless Steel
Number of Items: 1
Pattern: Solid
Included Components: bottle, lid
Product Care Instructions: Dishwasher safe
Base Diameter: 2.8 Inches
Cap Type: Flex Cap
With Lid: Yes
Is Dishwasher Safe: Yes
UPC: 810007834818
Manufacturer: Hydro Flask
Global Trade Identification Number: 18
Item Weight: 0.835 ounces
Department: unisex-adult
Item model number: S21SX010
Date First Available: January 3, 2020
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Mar 12
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
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.
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Reviewed in the United States on January 1, 2026 by Kady
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.
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Reviewed in the United States on October 26, 2025 by desert lady
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
Style: 24 Oz
Color: Indigo
I recently purchased the Hydro Flask and I am absolutely thrilled with my purchase! This sleek and stylish water bottle not only looks great, but it also delivers exceptional performance. The double-wall vacuum insulation keeps my beverages at the perfect temperature for hours. Whether it's a hot cup of coffee in the morning or a refreshing cold drink in the afternoon, the Hydro Flask maintains the ideal temperature with remarkable consistency. One of the standout features for me is its durability. The stainless steel construction feels incredibly sturdy, and it has survived a few accidental drops without a scratch. The powder-coated finish not only adds a premium touch but also provides a secure grip, preventing slips even when my hands are wet. I also appreciate the thoughtful design details. The wide mouth makes it easy to clean and fill, and it's compatible with various accessories like straw lids and coffee flasks, adding versatility to its functionality. The leak-proof design gives me peace of mind, allowing me to toss it in my bag without worrying about spills. In summary, the Hydro Flask has exceeded my expectations in terms of performance, durability, and style. It's not just a water bottle; it's an investment in quality and a statement of conscious living. I highly recommend it to anyone seeking a reliable, stylish, and eco-conscious hydration companion. Cheers to staying hydrated in style!
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Reviewed in the United States on October 1, 2023 by Medium Daddy
Style: 24 Oz
Color: Stone
Perfect gift for Christmas. Perfect size. Bought this as I trust the brand and have bought numerous bottles from hydroflask before. It's easy to use and does not leak. High quality. Dishwasher safe I guess. Let's goo!!
Reviewed in the United States on December 18, 2025 by SAGAR ADVANI
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.
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Reviewed in the United States on August 29, 2023 by Arman Bekzatyan
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!
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Reviewed in the United States on February 7, 2026 by Kathryn Magendie
Style: 21 Oz
Color: White
I only buy HydroFlask products. I have many different versions and I love them all. They retain heat well or maintain coldness well. They are leak resistant. I love the design of the cap with the handle. The lid is robust and well made. They come in a multitude of colors. I favor the 20 oz water bottle size. It’s a functional product. I love the icon symbol too. I recommend any of this company’s products.
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Reviewed in the United States on January 15, 2026 by Zon P