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Hydro Flask Insulated Stainless Steel Water Bottle, Standard Mouth, 21-Ounce

4.7 out of 5 stars 2,405 customer reviews
| 199 answered questions

Price: $27.95 & FREE Shipping on orders over $49. Details
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Arctic White
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  • Double wall vacuum insulated stainless steel water bottle keeps drinks cold for up to 24 hours and hot for up to 6 hours
  • Premium grade 18/8 Stainless Steel BPA free Sports Bottle
  • High quality colorful powder-coated matte finish exterior that never sweats
  • A great way to give back Hydro Flask donates 5% back to a charity of your choice
  • The Lifetime Warranty makes Hydro Flasks the best water bottles
$27.95 & FREE Shipping on orders over $49. Details In Stock. Sold by Tall Ridge and Fulfilled by Amazon.

Frequently Bought Together

  • Hydro Flask Insulated Stainless Steel Water Bottle, Standard Mouth, 21-Ounce
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  • Hydro Flask Standard Mouth Sport Cap, Black
Total price: $37.94
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Technical Details


Product Description

Hydro Flask's insulated water bottles are made of high quality food grade 18/8 stainless steel. The bottles have no liner (like most aluminum bottles) and are BPA free. Unlike plastic water bottles or single wall stainless bottles, Hydro Flask will keep your beverage of choice at your preferred temperature for hours, whether you choose hot, cold or room temperature liquids. All Hydro Flask products feature a lifetime warranty and are double wall vacuum insulated. They are designed to be lightweight, making them great for long hikes, days on the beach, hot yoga classes, golf, long road trips or everyday office use. Even when filled with ice, the exterior of your Hydro Flask will never leave a puddle on your desk, drip on your shirt, or sweat in your bag.

Product Details

Product Warranty: For warranty information about this product, please click here [PDF]
  • Shipping Weight: 1 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B00GA02OGW
  • Item model number: S21001-PARENT
  • Average Customer Review: 4.7 out of 5 stars  See all reviews (2,405 customer reviews)
  • Amazon Best Sellers Rank: #68 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
  • Product Warranty: For warranty information about this product, please click here [PDF]

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Color: Acai Purple Verified Purchase
Hydro Flask is pretty much the best thing ever.
I've already purchased 5 flasks (4 narrow mouth, 1 standard mouth) and recommend Hydro Flask to everyone I know, including strangers I meet at the gym or around the world as I travel.
I'm not ashamed of how many times I've thrown a Hydro Flask into my Amazon shopping cart.
I'm not even ashamed of how empty life felt after I lost my beloved orange Hydro Flask and had to return to work with a non-Hydro Flask water bottle (saddest, stupidest Monday ever).

I already wrote a rave review for the 24 oz. narrow mouth Hydro Flask; I purchased this 21 oz. standard mouth flask in Acai Purple for my mom.

Let me just say, Hydro Flask will always be my favorite thing ever.

HOWEVER, I've noticed the seller's product photos are way too bright, so if you're expecting to receive the exact color as the flasks shown in the photos, you miiiight be surprised.
I have Hydro Flasks in orange, pink, and purple - all of these are darker in real life than the seller's photos.
It's not a big deal to me (I LOVE my orange Hydro Flask) but for those expecting a certain color (the purple and pink seem to be way off) I've attached some photos so you know what to expect. :)

BOTTOM LINE: My life is now incomplete without Hydro Flask. BEST. THING. EVER.
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By Paul on September 2, 2013
Color: Nite Ops Black Verified Purchase
I am a skeptic when it comes to claims that bottles can keep water/liquids cold for hours and hours, but I read all of the reviews on this bottle and decided to buy one and try it. I live in Saudi Arabia where it is 115-120 degrees right now, and I thought there is no way this will work. I was wrong! I even had the bottle out in the desert on a shooting range for 5 hours under the scorching sun and my water was still ice cold. I'll admit that the ice melts in about 5-6 hours, but the water still remains very cold. The longest I have tested it so far is 15 hours, and I have not been disappointed-even after that long the water was still very cold. I love this thing-best purchase I ever made! I highly recommend this bottle to any skeptics that are like me.
Comment 171 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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On a recent project, I measured the heat loss on various size stainless steel insulated containers (Thermos bottles, coffee cups, etc.). I started by filling each container to its capacity with 200 degree water. Below are the temperatures for containers in the 16-24 oz. range after a 3 hour & 10 hour period - numbers shown after the item are: temp. after 3 hrs and temp. after 10 hrs. The list includes this item as well as the others listed. I also included a pretty much standard (larger size) 32 oz. Thermos bottle and a "no-name" 16 oz. insulated container with sealing cap & cup/lid that I got free for subscribing to a magazine for comparison. Items are listed in order of the content temperature after 10 hours.

32 oz Thermos 193,178
24 oz Thermos Direct Drink 180, 152
16 oz Thermos Backpack bottle 177, 143
16 oz No-Name publication give-away bottle 178, 142
21 oz Hydro Flask 177, 139
16 oz Thermos Cup rotating seal 169, 130
20 oz Kleen Kanteen 167, 125
24 oz Oxo Good Grips LiquiSeal 150, 104
16 oz Kleen Kanteen 151, 103
16 oz Starbucks Cup 144, 100

Over time, heat loss occurs through the double stainless walls with a vacuum between them. However, most heat escapes due to poor design, location, and sealing of the lid and/or stopper. Specifically the lid or stopper should seal at or below the upper end of the double wall vacuum section of the stainless portion of the container and the lid/stopper should have some kind of insulation itself, if only an internal air space.

For instance the stainless steel Starbucks cup itself has pretty good insulation qualities on its own and the lid seals just at the upper end of the double wall vacuum section.
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Color: Green Zen Verified Purchase
I like my water bottles like I like my men: frigid and able to keep everything bottled up inside. This water bottle is like my Prince Charming! It never leaks, keeps water just as cold as it was when you put it in, and is very durable. I'm assuming these characteristics aren't just specific to the green color, so I'd recommend you buy this in whatever color suits your fancy.
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Color: Everest Blue Verified Purchase
These bottles are real nice. The only comment that I have is if you have a choice between the narrow neck bottle and the standard neck, get the standard neck. It is much easier to put ice into!!!!!!
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Color: Green Zen Verified Purchase
This is the second Hydro I've bought and I can't get enough of it.
The larger mouth size makes so you can fit ice in easy, and the size is perfect.
I use it for coffee in the morning, water all afternoon, and then my beverage of choice in the evening.
Warning: If you don't leave the cap off when you first get the coffee, the coffee will take a very very long time to cool down to drinking temperatures.
Yes they are expensive, but long term they are entirely worth it.
No more buying water bottles and having warm water,
no more wasting coffee cups and having cold coffee.

LOVE
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Color: Green Zen Verified Purchase
This is not an original one. The design is crude. I have my other Hydroflask that I got from the Columbia Sports store that I have used for a year now (rather rough use), but it looks better and newer than the one I just ordered on Amazon. It has scratches on the surface and the cover doesn;t sit on the mouth nicely enough. I regret having bought this. Therefore, it is going back.
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