Hydro Flask 21 oz Standard Mouth w/ Sport Cap - Frost
Special Price $26.96 Regular Price $35.95 25% Off

Hydro Flask 21 oz Standard Mouth w/ Sport Cap - Frost

Hydro Flask 21 oz Standard Mouth w/ Sport Cap - Frost is rated 4.4 out of 5 by 515.
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Special Price $26.96 Regular Price $35.95 25% Off
21 oz Standard Mouth Insulated Water Bottle Hydro Flask
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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.

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.
Let's Go!

Today is wide open. You lead, we'll follow.

#HeyLetsGo

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 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 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 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 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 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 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 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 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 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 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 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 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 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 from Bottle I brought it for my sisters birthday and she loves it
Date published: 2020-09-10
Rated 5 out of 5 by 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 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 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 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 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 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
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Questions

Are all Hydro Flasks dishwasher safe?

Asked by: mama P
No, only the new 2.0 bottles are dishwasher safe. You can reach out to us at 888-584-9376 to determine if your bottle is dishwasher safe or not.
Answered by: Consumer Service
Date published: 2020-07-31

I would like to know if you guys still sell the mint colored 21oz standard mouth bottle. Also, do you guys bring back old colors? It was my favorite but I lost it and I can't see myself without that lovely color!

Asked by: Jess15
At this time we are not making the Mint color. Product colors are based on consumer feedback. I will forward your suggestion over to our product development team.
Answered by: Consumer Service
Date published: 2020-02-03

Can I order this bottle but with the flex-cap? I noticed that they don't offer the 21oz Standard Mouth w/ flex cap in the "frost" color.

Asked by: kyororo
The 21oz standard flask that comes with the flex cap is currently out of stock in the color Frost. Please contact customer service at 888-584-9376 to discuss this further.
Answered by: Consumer Service
Date published: 2019-10-30

My bottle has a rattle has something broken inside?

Asked by: Javo123
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.
Answered by: Consumer Service
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. 

Asked by: Katieroo
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.
Answered by: Consumer Service
Date published: 2019-10-29

what lids can be used with this bottle besides the sports cap and the flex cap?

Asked by: timmothy
The Standard Mouth Sports Cap and the Standard Flex Cap are the only caps available for the standard mouth flasks at this time.
Answered by: Consumer Service
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?

Asked by: Caterina
Normal sized ice cubes will fit in the standard flask.
Answered by: Consumer Service
Date published: 2019-10-27

So this bottle works w both the sports cap and the standard sized screw able lid? 

Asked by: Kayla14
Yes
Answered by: Consumer Service
Date published: 2019-10-27
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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.