21 oz Standard Mouth w/ Sport Cap
21 oz Standard Mouth w/ Sport Cap is rated
out of
5 by
548.
$26.96
Regular Price
$35.95
<h2>Hydration on the go.</span></h2>
<p>They're pretty much the perfect pair—our 21 oz Standard Mouth Bottle and our insulated Sport Cap. Together, they're your go-anywhere hydration companion. It stashes easily in a small shoulder bag, your pack’s side pocket, or your car cup holder, and holds enough to keep you going for hours without weighing you down.</p>
Hydration on the go.
They're pretty much the perfect pair—our 21 oz Standard Mouth Bottle and our insulated Sport Cap. Together, they're your go-anywhere hydration companion. It stashes easily in a small shoulder bag, your pack’s side pocket, or your car cup holder, and holds enough to keep you going for hours without weighing you down.
Features
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![TempShield™]()
![Pro-Grade Stainless Steel]()
![Proprietary Powder Coat]()
TempShield™
Our unique double wall vacuum insulation protects temperature for hours. Cold drinks stay icy cold and hot drinks stay piping hot so you can stay refreshed for any adventure.
Pro-Grade Stainless Steel
Made with 18/8 pro-grade stainless steel to ensure pure taste and no flavor transfer - and the durable construction stands up for whatever life brings.
Proprietary Powder Coat
Our proprietary powder coat means an easy-grip, sweat-free, and extra-durable bottle that you can take anywhere.
Details
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Product Benefits
- Versatile, middle-of-the-road size, equipped with our insulated Sport Cap
- TempShield™ insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours
- Durable 18/8 Pro-Grade Stainless Steel construction
- BPA-Free and Phthalate-Free
- Compatible with our Standard Mouth Flex Cap
- Lifetime Warranty
- Sport Cap is not intended for use with hot liquids and is not leakproof
Size & Dimensions
| 21 oz | |
|---|---|
| Volume | 621 mL |
| Mouth Diameter | 1.91" |
| Diameter | 2.87" |
| Height | 10.4" |
| Weight | 11.3 oz |
Technology
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Lifetime Warranty
We stand behind our products.
Hydro Flask guarantees this Hydro Flask product with a limited lifetime warranty against manufacturer defects.
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https://www.youtube.com/embed/SKjnrvgz-UY?rel=0&enablejsapi=1
Hydro Flask supports non-profit organizations focused on building, maintaining, restoring, and providing better access to parks. Since 2017, we have been doing just that:
-
92 Non-profits supported non-profits.
-
$1.5 million Dollars donated donated.
-
26,043 Bottles donated bottles.
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Reviews
Rated 5 out of
5
by
Dee02 from
Love it!
I own several different sizes and love them all!! HydroFlask is a great product!!!
Date published: 2020-11-06
Rated 5 out of
5
by
LLParrots from
Keeps drink cold and easy to carry
I bought the smaller 21 oz hydro so I could carry it when I’m walking or jogging Nd any other also fits in my stroller’s and car cup holder. Love the color as well! I did buy an aftermarket boot for it since this one did not come with one. The sport top works well for me and I can always I unscrew the top if I don’t want to use the sport top. Also no leaking and I do carry this inside my bag at times and not always upright. Great buy!
Date published: 2020-11-05
Rated 5 out of
5
by
jennH from
Great features
This is perfect for working out. I love it and use it all of the time.
Date published: 2020-11-01
Rated 5 out of
5
by
Anonymous from
Keeps water cold
I use this bottle everyday. I add ice each morning and fill with water. As the day goes on I add more water and never need more ice. Great look too. My husband has a boot on the bottom of his and I hope to purchase one for my bottle too.
Date published: 2020-10-26
Rated 5 out of
5
by
Dakota 4 Hydro Flask from
BEST BOTTLEE ER
Bought this two months ago! Easy to wrap my hand around it! Even with the boot it fits in my vehicle cup holder. 21 ounces! Has me drinking much more water. Doesn’t leak when I remember to close the spout! Easy to clean! Everyone compliments me on them- yes I said them! Bought two so I am never without a clean one. Might buy a third just to be sure!
Thus will be the last bottle you buy!
Date published: 2020-10-24
Rated 5 out of
5
by
Tayzilla from
Love it!
This is the 5th Hydro Flask I’ve bought and I’ve been beyond satisfied with each one. The Sports Cap is my favorite top by far.
Date published: 2020-10-19
Rated 5 out of
5
by
DC Yankee from
Does the job
I bicycle over 20 miles every Saturday and Sunday. The Hydro Flask keeps cold water cold for the whole trip. When I leave it overnight, it’s still cold the next day.
Date published: 2020-10-18
Rated 5 out of
5
by
Dakota 4 Hydro Flask from
STOP RIGHT HERE! YOU WONT BUY ANY OTHER!
I have tried many, many, many other water bottles..they leak, too big for most women to hold on to, and on and on. BUY HYDRO FLASK water bottle and you will never buy any other. I have two, so I can always have one in use. I walk every day and this goes with me!
Yes they fit in my car cup holder! Couldn’t be happier!
Date published: 2020-09-30
Rated 5 out of
5
by
Mish2 from
Keeps water cold
This water bottle cap is a better quality than the others, it keeps water cold but unfortunately my daughter already lost interest in it and likes the $10 water bottle from target better. The quality is good but overpriced in my opinion.
Date published: 2020-09-24
Rated 5 out of
5
by
Hahay from
I love it
It does not break it keeps my water cold and it is my favorite water bottle
Date published: 2020-09-21
Rated 5 out of
5
by
Tina06 from
Perfect for school.
I bought this a month ago for my daughter To use at school. It fits perfectly in her backpack.
Date published: 2020-09-18
Rated 5 out of
5
by
CalAli from
Love this!
My daughter bought me one and I loved it so much, I bought everyone in my family one. We live in a dry area of the country and I love having ice cold water to keep everyone hydrated. And we don't use bottled water any more so no more piles of plastic bottles. Healthy for us and the environment!
Date published: 2020-09-16
Rated 5 out of
5
by
StephSuz66 from
The color is awesome- keeps my drink ice cold
I bought this to fit into my bike cage for long rides - and it certainly does the job
Date published: 2020-09-16
Rated 5 out of
5
by
Razduck from
My Wife Lives It!
I bought the bottle and boot for my wife. She has always been jealous of me and my 21oz. HydroFlask. She has had other brands and has not been happy with them for one reason or another. She calls her new bright yellow HydroFlask, Perfect! Need I say more.
Date published: 2020-09-14
Rated 5 out of
5
by
Sax_singer52 from
LOVE LOVE LOVE
This bottle is awesome! I LOVE the sport cap, it just leaks a tad, but no biggie! Always can count on my Hydroflask to keep my ice water, ice water!
Date published: 2020-09-14
Rated 5 out of
5
by
Fiching from
Lemon love
Love lemon love the company. Quality product and the company cares about its customers. Important to still have a company and quality
Date published: 2020-09-13
Rated 5 out of
5
by
Mandyjo82 from
Loved it.
Used it two days then lost it in a house fire.... ugh.
Date published: 2020-09-12
Rated 5 out of
5
by
Savannahs mom from
Perfect for sports and school
I bought this a few weeks ago right before school started and I’m so happy with it. My daughter gets so excited that her water stays cold all day at school! And the sport mouth is perfect for kids as well!
Date published: 2020-09-12
Rated 5 out of
5
by
Liyah268 from
Bottle
I brought it for my sisters birthday and she loves it
Date published: 2020-09-10
Rated 5 out of
5
by
Suzet2249 from
Love the color and the size
One of many hydroflasks that I own. This one is perfect for my mini adventures.
Date published: 2020-09-05
Rated 5 out of
5
by
Tb22 from
Amazing
I’ve had this cup since Chrismas and it has no Detents or anything it’s is great condition highly recommend
Date published: 2020-09-03
Rated 5 out of
5
by
amorgan12 from
Ice cold always!
I love this bottle and finally understand the hype. No matter where I am my water stays ice cold. I also love the sports cap!!
Date published: 2020-08-28
Rated 5 out of
5
by
Poopama from
a step above
I bought 2 of these for my adult daughter and I. So happy I did, ice stays cold for more than 24 hours. Fits nicely in my car drink holder. The top is designed well and easy to grab with 1 finger and carry. I hesitated because it is a premium product which comes with a higher price but really the best thing for really ice cold water storage.
Date published: 2020-08-25
Rated 5 out of
5
by
Anonymous from
Love the sport top, so easy to drink out of
Couldn’t be more pleased , easy to drink and always cold
Date published: 2020-08-25
Rated 5 out of
5
by
MacMac from
Love the color and sport cap
Perfect size for my daughters lunch box, keeps her water cold all day and the sport cap doesn’t leak and is super handy!
Date published: 2020-08-25
Rated 5 out of
5
by
estherrr11 from
The perfect bottle
So happy with my purchase. Found my favorite color and it happened to be on sale. Keeps my drinks super cold and even when it’s all the way filled up it’s lightweight. Getting the sports cap was the cherry on top because i’m able to drink from it without taking the whole top off and i’m still able to carry it comfortably.
Date published: 2020-08-24
Rated 5 out of
5
by
PigButt from
Ice, ice, baby
The ice can't melt in this thing! Makes a great gong noise when it bumps against things.
Date published: 2020-08-23
Rated 5 out of
5
by
Mtj1405 from
Fantastic hydro flask
This is an incredible bottle. Keeps water cold with just a little ice all day. Love love this water bottle. Worth every penny!
Date published: 2020-08-23
Rated 5 out of
5
by
RenRen from
Cold water—-finally!
I bought my hydro flask about a month bag and I’m so happy with it. I’d tried other bottles that were supposed to keep water cold for long periods and was always disappointed. My hydro flask keeps my water cold all day long. I’m buying one for my daughter next!
Date published: 2020-08-21
Rated 5 out of
5
by
Linda runs from
Awesome
Love my hydro flask it’s a bright yellow and keeps my water icy.
Date published: 2020-08-20
Questions
My bottle has a rattle has something broken inside?
The rattle you hear is a small metal disc that sits between the double wall of your flask that aids in the vacuum insulation process. If the disc becomes dislodged, you’ll hear a small gritty noise or rattle. This will not affect the insulation or structural integrity of your flask.
Date published: 2019-10-30
Is the sports cap easy to open? My mom has arthritis and is looking for a water bottle she use easily.
When the sports caps are brand new, they can be a little hard to open and close. I would recommend a wide mouth flask with a straw lid.
Date published: 2019-10-29
what lids can be used with this bottle besides the sports cap and the flex cap?
The Standard Mouth Sports Cap and the Standard Flex Cap are the only caps available for the standard mouth flasks at this time.
Date published: 2019-10-27
Are you able to put ice cubes in the standard mouth bottle or is it to narrow for ice cubes to fit through the top?
Normal sized ice cubes will fit in the standard flask.
Date published: 2019-10-27
So this bottle works w both the sports cap and the standard sized screw able lid?
Yes
Date published: 2019-10-27
Can anyone recommend a bike cage for this bottle? I tried a plastic one to hold the bottle but the bottle was too heavy for the plastic and broke. I now have a metal cage but the metal on metal makes a lot of noise while riding my bike.
We regret to inform you that our products are not specifically designed to be carried in bike cages and they have not been tested for such use. We would be concerned about the possibility of the cage causing scratches, chips, and dents to your flask from improper fit and jostling. Therefore, we do not recommend carrying Hydro Flask products in bike cages.
Date published: 2019-07-14
Is anything being done about the leaky sports lid? I wanted to get one for my husbands birthday.
If the cap starts to leak, we'd be happy to replace your cap for you under our Lifetime Warranty. You can fill out a warranty claim here: (http://www.hydroflask.com/warranty/)
Date published: 2020-07-28
I see several complaints about the sports cap leaking. I want a cap that you don't have to unscrew to drink from and need the standard size to fit into my cupholder. Anyone have good experience with the sports cap or recommendations for a different one?
The Standard Mouth Sports cap is NOT advertised as leak proof, and there is potential for dripping if overturned or shaken. If transporting your flask in a situation where it may not remain upright or could be jostled, we recommend using a sealed lid such as the Flex Cap.
Date published: 2020-07-28
Do I need to purchase a straw for this water bottle or is the included sport cap all I need?
The sports cap is made to be tilted up to drink from.The product does not come with a straw included.
Date published: 2019-12-22
Does it have a straw in it?
The Sports Cap just has the spout. It does not have a straw in the lid.
Date published: 2019-05-31
Which bottle best fits into a bicycle water bottle cage holder? Could you please include photos of bicycles with a hydroflask in the bottle cage? It would be so much more helpful than your standard response to this question on the FAQ page.
I use the 21 oz bottle with the flex cap in my bike holder and I believe the 24 oz would also fit since it’s just taller.
Date published: 2019-05-07
I’m planning to order a hydro and would love to put stickers on it. What is the area of this hydro so I’ll know how many stickers to order? Thanks!
Quinlan21,
Product dimensions can be found on our FAQ page. You can see them here: http://www.hydroflask.com/frequently-asked-questions/
Date published: 2019-05-07
Will a straw lid be available for the 21oz HF?
We do not currently manufacture a product that matches your request, but we’ll document your suggestion for future consideration by our Product Development Team.
Date published: 2019-07-13
Why does it say the bottle will keep beverages cold or hot and then say hot beverages not recommended? I find this confusing and misleading.
The sports cap is what is not recommended with hot beverages. You can use the flask for hot and/or cold beverages, but the sports cap should not be used. You would want the flex cap.
Date published: 2019-10-18
Are your products made inUSA?
We appreciate your interest in Hydro Flask.
Our flasks are manufactured in China, and the caps are manufactured in both China and USA.
If you have a specific question or concern, please reply with more detail and we'll be happy to assist you further.
Date published: 2020-05-13
Is the Hydroflask dishwasher safe?
We do not suggest putting your flask through the dish washer. For cleaning, we recommend hand washing with a bottle brush and mild dish soap.
Date published: 2019-09-11
what is the diameter in inches of the water bottle mouth opening? would it fit a 2.5" lid?
Product dimensions can be found on our FAQ page. You can see them here: http://www.hydroflask.com/frequently-asked-questions/
Date published: 2019-09-11
Can you use the sport top with hot liquids?
No, it is not recommended.
Date published: 2018-01-17
do you have a straw lid that fits this 21 ounce sized bottle? It says only sport top and screw off fit but we'd like the straw for my daughter for school.
We do not currently manufacture a product that matches your request, but we’ll document your suggestion for future consideration by our Product Development Team.
Date published: 2020-11-14
will the top leak if it tips over in a bag?
The standard mouth flex cap will not leak. The sports cap will leak if it is not completely closed.
Date published: 2019-02-12
Do you make flip caps with straws for the 21 oz bottle?
We do not currently manufacture a product that matches your request, but we’ll document your suggestion for future consideration by our Product Development Team.
Date published: 2017-08-01
why you not got straw mouths for the lil bottles? huh?
We do not currently manufacture a product that matches your request, but we’ll document your suggestion for future consideration by our Product Development Team.
Date published: 2017-08-01
I just purchased this water bottle with the sport cap (no straw). It makes a high pitched noise when I drink from it most of the time. I can't figure out why or how to make it stop making the noise. Any ideas?
We'd be happy to replace your cap for you under our Lifetime Warranty. You can fill out a warranty claim here: (http://www.hydroflask.com/warranty/)
Date published: 2019-08-05
I purchased a straw lid for my bottle. I cut the straw to fit but it doesn't get a suction, when I suck all I hear is air. How do I make it work? I checked the spot where the straw attaché and its on very snugly. Thanks
We'd be happy to replace your cap for you under our Lifetime Warranty. You can fill out a warranty claim here: (http://www.hydroflask.com/warranty/)
Date published: 2017-07-21
Can you please share height and diameter at wides point of this bottle. My new car's cup holders are ridiculously narrow. Trying to fine a bottle to work/fit.
Product dimensions can be found on our FAQ page. You can see them here: http://www.hydroflask.com/frequently-asked-questions/
Date published: 2017-07-30
Why on earth does my sport cap make so much noise (air) when I try to drink out of it??? I barely get any water unless I tip it far back, and even then I get half air. What am I doing wrong????
We'd be happy to replace your cap for you under our Lifetime Warranty. You can fill out a warranty claim here: (http://www.hydroflask.com/warranty/)
Date published: 2017-07-30
I would like to buy 21 fl oz sport hydroflask for my road bike since I don't want to drink water out of plastic bottle. Do you think it will fit in the regular bike holder? Also, is it easy to drink out of it using just one hand?
Product dimensions can be found on our FAQ page. You can see them here: http://www.hydroflask.com/frequently-asked-questions/
Date published: 2017-12-26
I dropped my 20 oz wide mouth bottle and dinged it on the bottom, so it now wobbles a bit when I set it down on my desk. Still works fine but it's annoying. Is that covered under warranty?
Accidental damage, dents, dings, scratches, etc. is not covered under the lifetime warranty.
Date published: 2017-12-26
I have a 21oz HF jug I need only a replacement top. Can I buy one [sport cap] from you? (btw - your 'Nickname' requirement is stupid and no I don't wanna be a member of a nickname club, thank you)
We'd be happy to replace your cap for you under our Lifetime Warranty. You can fill out a warranty claim here: (http://www.hydroflask.com/warranty/)
Date published: 2017-05-19
What # plastic do you use on the flex cap? Thank you!
It is plastic number 7.
Date published: 2017-05-12
Hydro Flask supports non-profit organizations focused on building, maintaining, restoring, and providing better access to parks. Since 2017, we have been doing just that:
-
92 Non-profits supported non-profits.
-
$1.5 million Dollars donated donated.
-
26,043 Bottles donated bottles.