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21 oz Standard Mouth Vacuum Insulated Stainless Steel Water Bottle
Product Description
The 21 oz is ideal for taking on the weekend bike ride or hike to keep your fluids cold. Or take it up the mountain and have coffee, hot cocoa, or soup waiting for you at the end of the day.
The standard mouth features a larger opening than our original narrow mouth bottle. It is ideal for coffees, teas, mixing sport drinks, or just for those who need to take in more hydration, more quickly. As with all our bottles, they fit perfectly in most car, bicycle, and stroller cup holders and water bottles cages.
Our stainless steel water bottles were developed to perform in every environment. Each Hydro Flask is hand cast from double wall vacuum insulated food grade 18/8 stainless steel, therefore they are BPA-Free and resistant to bacteria and odors. Our double wall vacuum insulation technology allows Hydro Flasks to keep contents hot for 12 hours and cold for 24 hours. Look for the silver ring on the neck of every Narrow Mouth and Standard Mouth Hydro Flask to ensure you're getting the best performing water bottle on the market.
Features:
- Patented Standard Mouth Size
- Double Wall Vacuum Insulated
- Keeps Hot 12 Hours
- Keeps Cold 24 Hours
- BPA-Free
- 18/8 Stainless Steel
- Signature Matte Finish
- Lifetime Warranty
View the Hydro Flask Infographic to learn more about our features.

Here's what people have to say about this:
Write Your Own Review
18 Item(s)
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Great for bicycle riding in hot sun
Posted by Una Nelson-White on 29th Apr 2013
Price Value Quality 21 oz standard mouth bottle w/ sports cap is perfect fit for regular bicycle water bottle holder on bikes. I love the fact it keeps water cold on long hot rides, unlike any other water bottles out there including the so called insulated one with a bear on it. My food coop carries the larger size but I am going to ask them to carry this size for all the bike riders who use the coop.
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Hydro Flask rocks!!!
Posted by Dana A. on 3rd Dec 2012
Price Value Quality Received my 21 oz flask/bottle for Christmas 2011. I've taken it up 12 or Colorado's 14,000' mountains this year. Kept my drinks cold during the summer, and kept my hot drinks hot for 12 10-12 hours this fall. Taken a couple tumbles on the peaks, minor paint chipping and dents.
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Couldn't be happier
Posted by Lindsey on 22nd Oct 2012
Quality Price Value As an outdoor professional in Hawaii, I have struggled to find a water bottle that suits my lifestyle and will keep my water cold...until now! I have the 21oz standard and it's perfect! I will be getting more!!!
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My Favorite Backcountry Comfort Object!
Posted by Peter on 24th Jun 2012
Value Quality Price Got the 21 oz. standard mouth Hydroflask 6 months ago, it's great for hot tea or cocoa when you're snowshoeing, hiking or skiing in winter, a solid pick-me-up when you need a quick warm up to re-energize, keeps drinks hot for a solid 8+ hours outdoors. Now that its summer, I was amazed how cold it keeps drinks, without the ice cubes melting, a real treat to cool off with after a long hot trail run. No problems at all with the black coating, looks like new after a lot of hot and cold weather use and long road trips.
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The Best Bottle I ever have.
Posted by Lillian on 15th Jun 2012
Value Quality Price This bottle has gone with me everywhere for the last two years. Keeps my fluid cold for ever. I was driving my motorcycle and my bottle fell, I went to get it and was Not damage(only the paint a little). I Really LOVE it!!! The price it's worth it.
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AMAZING!!!!!!!!!
Posted by HR on 15th Feb 2012
Price Value Quality No bad things really.... This bottle has gone with me everywhere. I love it. Keeps my water cold for ever. I love to amaze my friends by pulling it out of a hot car or after a long hike and say ha! I have refreshing delicious-ness.
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Worth the price for those who work outdoors
Posted by Nic on 31st Jan 2012
Price Value Quality I never thought I'd spend this much on a bottle, but it's worth it. I work outside through every season and this has yet to disappoint me. It keeps my drink warm/hot even when spending hours in below freezing temps.
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Everything but the top
Posted by Ty on 13th Jan 2012
Quality Price Value This is a great bottle. Keeps cold things cold and hot things hot, but...the top comes apart. The thread section comes apart from the section with the carabiner and makes it difficult to open. (You may notice they are selling replacement tops in the accessories section.) Also, as mentioned in other reviews the paint does chip some. Overall, good water bottle. Just fix the top design.
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True to its promiss
Posted by Valerie on 6th Oct 2011
Value Quality Price I have to say I have NEVER had a water bottle this good. My ice stays ice all day and night. You will not be disappointed. Best investment I have made.
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Search is over - the best bottle out there
Posted by Steve on 15th Jul 2011
Price Value Quality Yes, it lives up to the hype. I ordered a 21oz standard mouth, orange, for a recent trip we were taking. This thing is made exceptionally well. It was also able to keep ice\water cold, real cold, for full days in the 95+ degree weather. I'll be ordering another for an upcoming trip, so we don't have to refill as often. 8-)
Note: The standard mouth is a great size for standard size ice cubes. I was worried it would be too large for comfortable drinking, but it is perfect!
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Best Bottle Ever
Posted by Chris on 28th May 2011
Price Value Quality Bought the 21 oz Orange at the Saturday Market in Portland on a recent trip and absolutely love it! I haven't had any issues with the paint chipping. Can't wait to get / try the beer growler!
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Excellent product
Posted by JD Scott on 27th May 2011
Price Value Quality Living in the desert, I have tried various water bottles and none have kept anything cold for very long until the Hydro Flask. It is without a doubt the best I've used. I'll be getting more for the family soon!
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Awesome
Posted by Amby on 16th May 2011
Price Value Quality this product is awesome, a little pricy, but considering how much other wate bottles are it's a good deal!
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Dimensions and Opinion
Posted by Craig F on 21st Nov 2010
Price Value Quality Dimensions (not official but according to my tape measure)-- 24 oz. flask: 7.5cm in diameter at base, 3.5cm/diameter internal mouth opening, 27cm height (without cap), 30.5cm with cap. Excellent product, it does keep the ice frozen in water for hours--8hrs, 6 cubes (Conditions: Classroom Teacher). Haven't tried any hot liquids yet. There is no "bottle sweat" or thermal leak to the outside layer of metal. P.S.--The company gives 5% of your purchase price to a charity of your choosing.
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Keep it cool
Posted by S. Cheng "mrwaste" (Santa Fe, NM) on 21st Nov 2010
Price Value Quality I bought it to replace a cheap one I bought from WalMart. The difference is night and day, even it is much more expensive. The flask is well built with study stainless steel. I like to put the ice water in it. For over 24 hours, it is still cold. It is exactly what is advertised.
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Great bottle with one problem
Posted by Shlompsen on 21st Nov 2010
Price Value Quality This is a very nice bottle from a good company. I prefer it to the Sigg bottle I had before because of the insulation and the absence of weird chemicals on the inside. The threads between the bottle and the cap are not as well toleranced as the Sigg bottles, but the seal is very good and it never leaks. The main problem I have is that the paint on the outside of the bottle rubs off very easily and it gets all over the other things in my bag, including my computer and my books. So if they could re-engineer the paint and maybe tighten up the tolerance in the screw threads, it would be a perfect bottle. But, as it is, it is still my favorite water bottle.
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Best Water Bottle
Posted by F. Jasman (Greenville, SC) on 21st Nov 2010
Price Value Quality This is the third HydroFlask water bottle I've bought. I've only used them for cold liquids, and they really keep liquids cold. I used to take a Tervis tumber with me to work (with ice inside), but since discovering these, they are now what I take with me. They keep ice longer and liquids colder longer than the Tervice tumblers, and are much sturdier. I just wish Amazom carried the caps too, because the HydroFlask sports caps are a very nice accessory to have. Highly recommend any water bottle by HydroFlask, a great product all around.
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Good thermal qualities, paint starts to chip quickly
Posted by Jonathan Manili (Nicaragua) on 21st Nov 2010
Price Value Quality Works well with hot and cold. I have the evergreen, nice color but the paint starts to chip quickly. Not big chunks but it's noticeable.
18 Item(s)
