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  • Hydro Flask Insulated Stainless Steel Standard Mouth Drinking Bottle (21-Ounce, Acai Purple)
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Hydro Flask Insulated Stainless Steel Water Bottle, Standard Mouth, 21-Ounce

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List Price: $27.99
Price: $25.19 & FREE Shipping on orders over $35. Details
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Acai Purple
  • Double wall vacuum insulated stainless steel water bottle keeps drinks cold for up to 24 hours and hot for up to 12 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
28 new from $23.39 4 used from $17.63


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

Color: Acai Purple
  • Product Dimensions: 10.6 x 2.8 x 10.6 inches ; 10.4 ounces
  • Shipping Weight: 11.2 ounces (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • Origin: China
  • ASIN: B004H61L24
  • Item model number: S21520
  • Average Customer Review: 4.7 out of 5 stars  See all reviews (747 customer reviews)
  • Amazon Best Sellers Rank: #92 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
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Customer Questions & Answers

Customer Reviews

Keeps hot drinks hot and cold drinks cold all day long.
Giants Deb
It keeps my ice water cold all day, even when I left it in the car for a few hours while shopping.
wmychel
Excellent product and will look for more from Hydro Flask in the future.
Benjamin

Most Helpful Customer Reviews

63 of 65 people found the following review helpful By Paul on September 2, 2013
Color Name: 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.
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50 of 54 people found the following review helpful By RH on January 26, 2014
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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42 of 45 people found the following review helpful By P. Morris on February 18, 2012
Color Name: 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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28 of 30 people found the following review helpful By Sara on May 7, 2014
Color Name: 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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9 of 9 people found the following review helpful By Natalie sheffield on April 10, 2014
Color Name: 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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26 of 32 people found the following review helpful By M. Sharpe on September 25, 2013
Color Name: Nite Ops Black Verified Purchase
Quality product made from quality materials. Definitely does a good job keeping water cold. I haven't tried using for hot beverages yet but I suspect it will perform well. Since some other reviews mentioned a metallic taste when first using the flask, I should mention that I did NOT have any such issue.

I selected the standard mouth vs. the narrow mouth Hydro Flask because other reviews indicated that you can insert ice cubes from a "regular" freezer / ice maker (e.g. Whirlpool). That's true. However, the standard mouth does NOT offer the two most attractive lid options: Flip Cap or Straw lid. As a result, you have to unscrew the cap or leave it off to take a drink - kind of a pain. The only other lid option for the standard mouth is a sport lid and it didn't get good reviews. Thus, I gave the standard mouth only 4 stars and I recommend the wide mouth flask at 5 stars.
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6 of 6 people found the following review helpful By Gary Prince on September 11, 2014
Color Name: Desert Tan/Tactical Verified Purchase
This is a great insulated bottle at a reasonable price. I own two of the 12 oz narrow mouth (for the car, the office, or around the house) and two 21 oz narrow mouth (for hiking or working outdoors). So far I have used them for cold drinks, and they really work. I have tested the bottle's insulating capabilities repeatedly: If you put a pre-chilled cold drink in the bottle with one ice cube, then leave it capped, some of the ice cube will still be unmelted 24 hours later. Even when I left a 12 oz bottle in my car's dashboard cup holder throughout a long hot sunny day, the contents were still chilly when I returned to the car.

The powder coat finish really does prevent condensation the way the manufacturer claims. Also, the rim of the bottle is a smooth metal insert that is easy on the lips when drinking.

I like having a sip cap when driving or hiking, but the Hydroflask's cap did not get good reviews. I tired the Klean Kanteen Sport Cap 3.0 (available on Amazon) and it fits perfectly. Screw it down firmly, and you have a no-muss, no-fuss cap that does its job very well. It fits the 12 and 21 oz narrow mouth bottles (the 18 oz narrow mouth has a smaller opening for some reason, nor will the cap work with any of the wide mouth bottles).
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