Bottles

21 oz Standard Mouth

$32.95
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Bottles

21 oz Standard Mouth

$32.95

Lifetime

  • Flex Cap
    Flex Cap
    Included
  • Sport Cap - +$6.00
    Sport Cap
     
$32.95

Quantity

Customize Purchase via Dealer

Sale discount on this color will be automatically applied in cart.

Overview

Your perfect travel companion.

Keep life moving with our 21 oz bottle and Standard Flex Cap. It stashes easily into a small shoulder bag, your pack’s side pocket, or your car cup holder, and holds enough ice cold goodness to keep you going for hours without weighing you down. No wonder it's one of our bestselling water bottles.

Product Benefits

  • Versatile, middle-of-the-road size
  • 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 Standard Mouth Insulated Sport Cap
  • Lifetime Warranty

Size & Dimensions

21 oz
Volume 621 mL
Mouth Diameter 1.91"
Diameter 2.87"
Height 9.4"
Weight 11.3 oz
  • TempShield

    Tempshield

    Colder. Hotter. Longer.

    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.

  • Proprietary Powder Coat

    Proprietary Powder Coat

    Comfortable and durable.

    Our proprietary powder coat means an easy-grip, sweat-free, and extra-durable bottle that you can take anywhere.

  • BPA-Free

    BPA-Free

    Sip and enjoy.

    Our products are BPA-free for ultimate purity. Stay refreshed and worry-free.

  • Lifetime Warranty

    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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Overview & Specs

Overview

Your perfect travel companion.

Keep life moving with our 21 oz bottle and Standard Flex Cap. It stashes easily into a small shoulder bag, your pack’s side pocket, or your car cup holder, and holds enough ice cold goodness to keep you going for hours without weighing you down. No wonder it's one of our bestselling water bottles.

Product Benefits

  • Versatile, middle-of-the-road size
  • 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 Standard Mouth Insulated Sport Cap
  • Lifetime Warranty

Size & Dimensions

21 oz
Volume 621 mL
Mouth Diameter 1.91"
Diameter 2.87"
Height 9.4"
Weight 11.3 oz

Technology

  • TempShield

    Tempshield

    Colder. Hotter. Longer.

    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.

  • Proprietary Powder Coat

    Proprietary Powder Coat

    Comfortable and durable.

    Our proprietary powder coat means an easy-grip, sweat-free, and extra-durable bottle that you can take anywhere.

  • BPA-Free

    BPA-Free

    Sip and enjoy.

    Our products are BPA-free for ultimate purity. Stay refreshed and worry-free.

  • Lifetime Warranty

    Lifetime Warranty

    We stand behind our products.

    Hydro Flask guarantees this Hydro Flask product with a limited lifetime warranty against manufacturer defects.

Video

Reviews/Q&A

  • Reviews

  • Q & A

  • 21 oz Standard Mouth is rated 4.7 out of 5 by 410.
    Rated 5 out of 5 by from Great product Keeps water cool! Doesn’t change the taste of the water. I need a Hydroflask in ever size and color now!
    Date published: 2019-07-29
    Rated 5 out of 5 by from Best water bottle!! Sturdy. Keeps Cold AND hot. Sleek looking and overall, just LOVE this watebottle. Best one ever purchase.
    Date published: 2019-07-28
    Rated 5 out of 5 by from Lightweight and durable This is my second Hydroflask water bottle and it is my favorite of all brands. I can put ice cubes and water and it stays cold with ice cubes for hours. it is easy to carry to the gym and when I’m out and about. The new colors are beautiful.
    Date published: 2019-07-28
    Rated 5 out of 5 by from Love it I love my hydro flask! It’s my second one and I don’t regret it!!
    Date published: 2019-07-28
    Rated 5 out of 5 by from Love the color! I got it a few weeks ago and it’s super cute!! Can’t wait to start using it!
    Date published: 2019-07-28
    Rated 5 out of 5 by from Perfect bottle, all day, everyday. I love Hydro Flask. I have had an 18 oz Wide Mouth with a Hydro Flip cap for the past four years and it was my trusty water bottle for all of high school. Though I dropped it several times over the years, all my Hydro Flask suffered was a few dents. It is still in top working condition. Your bottle will keep ice in it overnight and will never condensate on the outside. Most recently I bought a 21 oz Standard Mouth with a Flex Cap to increase my Hydro Flask "collection." You'll find you're soon wanting a second too. I highly recommend buying a Small Flex Boot to accompany your bottle. It keeps the bottle quiet when you place it on a surface. FYI - the new color, "Frost," appears a bit brighter on the website than in person. However, it's a beautiful color either way. My only complaint is how long the shipping process took - I ordered my Hydro Flask and it came 17 days later. Regardless, I highly recommend this product. It's a purchase you won't regret.
    Date published: 2019-07-25
    Rated 5 out of 5 by from Absolutely love! I bought this a couple weeks ago and truly love it. now my whole family wants one!
    Date published: 2019-07-23
    Rated 5 out of 5 by from Great!! I love this bottle! I also bought the tumbler and they both keep things cold for hours and hours. My only complaint would be that cubed I’ve sometimes doesn’t fit through the mouth of the bottle.
    Date published: 2019-07-20
    Rated 5 out of 5 by from Love the color and size! I bought this bottle in the sports bundle for myself and as a gift to my friend and I'm happy with the results! I love that it came with two different cap styles that I can easily switch out. The color options are also great. I got frost and white, loved them both.
    Date published: 2019-07-15
    Rated 5 out of 5 by from Excellent bottle!! I bought this about a month ago and the first bottle I received had a dent but it was quickly resolved when I contacted customer service. The color is exactly what I wanted. The bottle fits into my car cup holder which is why I splurged for a standard bottle even though I own a wide mouth 32 oz.. Keeps water cold for hours! Easy to carry around, even when filled with ice and water.
    Date published: 2019-07-15
    Rated 5 out of 5 by from Awesome I bought this becuse I have a 36oz and it was too big and heavy to carry around to places to I bought this slender one to use for everyday use
    Date published: 2019-07-11
    Rated 5 out of 5 by from Keeps cold for a long time Omg it is like the best water bottle ever it keep my water cold all day and I use it all the time
    Date published: 2019-07-10
    Rated 5 out of 5 by from I love how you can customize your own bottle! I love the colors and the fact my ice has not melted yet.
    Date published: 2019-07-08
    Rated 5 out of 5 by from Best Water Bottle Ever! I bought mine about two months ago and used it while on a very long road trip. It kept my ice frozen for two days straight! Very cute bottle, fun to decorate. The 21 ounce bottle is the perfect size for traveling, and the bottle works amazingly.
    Date published: 2019-07-08
    Rated 5 out of 5 by from Love it! I got mine 4 months ago. And I love it!!! Yes, it does dent easily but, I I don’t mind the dents. I just ordered my second one! I can’t wait to get it!
    Date published: 2019-07-03
    Rated 5 out of 5 by from keeps cold! I have loved my new hydro! it keeps water cold and is super cute! it's helped me to start drinking more water!!
    Date published: 2019-07-01
    Rated 5 out of 5 by from Amazing Product!! I have 4 hydro flasks. They’re all great. They’re durable, nice looking, and it keeps your drink hot or cold. I love all my hydro flask!! ❤️
    Date published: 2019-06-28
    Rated 5 out of 5 by from Great Quality Life changing I bought this a week ago and I don’t regret it except it didn’t come the color I wanted it instead of being like a little like he came like like a light purple kind of like a lavender color
    Date published: 2019-06-15
    Rated 5 out of 5 by from perfect my ideal daily water bottle, love the lilac color sm
    Date published: 2019-06-09
    Rated 5 out of 5 by from Will Keep Sparkling Water Fizzy and Cold All Day My wife doesn’t like flat water, but loves sparkling water. We were looking for a water bottle that would keep the fizz and cold of sparkling water while we backpacked and we’re told about these by the sales people at REI. They work great.
    Date published: 2019-06-07
    Rated 5 out of 5 by from I can get ice cubes in easily! My Swell bottles were showing more than a little water, dented and wobbling. I decided to try a different shape! Very happy
    Date published: 2019-06-07
    Rated 5 out of 5 by from Only water bottle I use... I enjoy my Hydro Flask. This size is good for half a day out, and the 32 is good for a whole day. It keeps my drinks icy and refreshing for hours. It’s durable and easy to clean too. The bottles don’t sweat. IMO, these bottles are pricey but worth it because they don’t wear out EVER.
    Date published: 2019-06-06
    Rated 5 out of 5 by from The color! Bought another one in this color because I'm so sad they are retiring it!! Hydroflask, please don't retire this color!!!
    Date published: 2019-06-05
    Rated 5 out of 5 by from Great water bottles These can be brought a lot of places the only down side is that they dent easily.
    Date published: 2019-06-03
    Rated 5 out of 5 by from Great for all ages! Got myself this awesome bottle, and my baby decided he wanted it. Now I have an excuse to buy another one!
    Date published: 2019-05-31
    Rated 5 out of 5 by from Perfect bottle Bought it for my daughter. She loves it! Great color and perfect size.
    Date published: 2019-05-31
    Rated 5 out of 5 by from Love it! I wanted a hydro flask for awhile and held off on purchasing one to make sure I truly wanted it and that it wasn’t just for the hype. Well the hype is real and totally worth it! I love it!
    Date published: 2019-05-29
    Rated 5 out of 5 by from replacement w/ the lifetime warranty I bought this yesterday...and i wanted to ask if my 18 oz standard hydro flask can be replaced with a 21 oz, because i feel like the 18 oz is small, can it be replaced with the use of its lifetime warranty?
    Date published: 2019-05-25
    Rated 5 out of 5 by from Sleek bottle! I received this very sleek and trendy bottle. I have been using it for water throughout the day. It holds a decent amount of water. The bottle keeps liquid cold for several hours which is a plus. The sleek design with the black matte finish is beautiful. I have actually purchased this bottle in other colors for my family. We love it!
    Date published: 2019-05-08
    Rated 5 out of 5 by from Worth the Money! My water bottle works great! It keeps the water so cold all day long. My ice was able to stay frozen for up to six hours. Best water bottle company!
    Date published: 2019-05-01
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  • Do you ship to Australia? How much is the postage?

    Asked by: sugarlotus866
    We do not ship international.
    Answered by: Hydro Flask Customer Team
    Date published: 2018-01-14

    can the waterbottle shown above be used for HOT and cold also if i do the lid and the add on one can that be used for hot drinks

    Asked by: dudek1313
    The flasks can be used for hot and/or cold beverages. This flask is a standard mouth flask. Our hot beverage cap would be the flip cap which is for wide mouth flasks. So, if you want that cap, it would have to be a wide mouth flask.
    Answered by: Hydro Flask Customer Team
    Date published: 2018-01-11

    Hi! Is this product dishwasher safe?

    Asked by: RaspyRach
    No. We do not recommend placing the flasks in the dish washer.
    Answered by: Hydro Flask Customer Team
    Date published: 2019-03-20

    Does the 21 oz fit in a standard car cup holder? What are the dimensions?

    Asked by: gm23
    Product dimensions can be found on our FAQ page. You can see them here: http://www.hydroflask.com/frequently-asked-questions/
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-01

    Does this size fit in most car cup holders? 

    Asked by: Christina B
    Yes, the 21 oz would usually fit. It usually is those 32 oz and up that do not fit in the standard car holders.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-01

    What is the width of the bottom?

    Asked by: Alley132
    Product dimensions can be found on our FAQ page. You can see them here: http://www.hydroflask.com/frequently-asked-questions/
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-13

    How long will these keep drinks hot for? I typically only drink ice cold beverages, but going to an outdoor football game tonight!

    Asked by: MommaTiah
    We say up to 12 hours.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-11-29

    Why does the hydration bottle say they keep liquid hot for 12 hours where the coffee bottles say they keep it hot for 6?

    Asked by: Leddy
    This would be a difference of the cap. The hydration flasks have the flex cap which does not have any openings and has the honeycomb insulation. The flip cap that comes on the coffee flasks has a hole in the cap and does not have the honeycomb insulation.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-14

    Is this water bottle spill proof?

    Asked by: Raincloud
    The flex cap would be the leak proof cap.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-14

    I want to purchase a 21oz standard mouth but does the straw lid fit on it? 

    Asked by: Awesome
    We currently do not make a straw cap for standard mouth flasks.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-13

    Does the sport cap work on this?

    Asked by: aje05
    Yes, the sports cap would fit any standard mouth flask.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-10-05

    Can these products be used in the microwave/

    Asked by: kbabe
    No, we would not recommend putting the flask in the microwave. It is made out of stainless steel.
    Answered by: Hydro Flask Customer Team
    Date published: 2018-05-27

    Are any of the hydro flask water bottles dishwasher safe? If not how do I clean them?

    Asked by: Ciara
    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.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-09

    Hi! so with "TempShieldTM insulation eliminates condensation" no sweating? My youngster doesn't have a side pouch to his backpack for a waterbottle and we can't have soggy homework ... :)

    Asked by: Suz ML
    The flask should not have any condensation on the outside of the flask.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-14

    maybe make this in blush pink?

    Asked by: custumer123
    Product colors are based on consumer feedback. I will forward your suggestion over to our product development team.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-18

    how tall is the 21 oz flask

    Asked by: jayceearmo
    Product dimensions can be found on our FAQ page. You can see them here: http://www.hydroflask.com/frequently-asked-questions/
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-14

    Can you personalize these?

    Asked by: Aja Sui
    At this time we do not offer any engraving services for personal or corporate orders. We suggest reaching out to trophy or engraving shops for a quote!
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-18

    I have the 21 oz. hydroflask with the  2 inch opening (roughly). Where Can I buy a new caos. 

    Asked by: Bobby D
    You can purchase it from our website under accessories, or click on find a store at the top right of our website.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-07-26

    Are these bottles able to be put in the dishwasher?

    Asked by: Elysse
    No, we do not recommend the dishwasher for the flasks.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-14

    Hi, I have a couple hydrofkasks and both have the lead gaskets coming out every time I open it. I bought it only a couple months ago. I heard about your life warranty so I wondered how I could use it to fix this issue.  Thanks, 

    Asked by: Kristina_Kristina
    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/)
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-14

    Can you easily put ice cubes into the standard mouth bottles?  Or are they a bit limited?

    Asked by: Crys
    You can put ice in the standard mouth. I have never had any issues. The mouth diameter of the standard is 1.91 inches compared to the wide mouth at 2.28 inches.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-06-29

    Do you still over the standard mouth with loop cap?

    Asked by: candacejennings
    We do still have loop cap available for warranties. Just go to www.hydroflask.com/warranty.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-07-01

    How tall is the 21oz bottle? Diameter? Thanx

    Asked by: Stace99
    Product dimensions can be found on our FAQ page. You can see them here: http://www.hydroflask.com/frequently-asked-questions/
    Answered by: Hydro Flask Customer Team
    Date published: 2017-06-23

    hi. I'm interested in buying the 21 oz Standard Mouth in white color, but I wanted with a different cap. With the one with the hole inside like the one you advertise in the video above. Is it possible to get it, or do you no longer manufacture those? 

    Asked by: iris690
    You can do a warranty claim for the standard loop cap, but they are no longer for sale. It has been replaced with the standard mouth flex cap.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-18

    hi just want to ask if you still  have the free shipping promo of i buy two hydro flask 

    Asked by: hiroshi
    Yes. If you order two or more flasks you would get free shipping.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-18

    Are you guys out of the mint color 21 oz water bottle because I ordered one and it came in the new sage color?

    Asked by: payton512
    Call us at 888-584-9376.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-18

    I am the manager of a private high school campus store and wonder if you give any discount or sell wholesale? I know our students would love to have a hydro flask with our logo!!

    Asked by: dmccarthy
    You can call us at 888-584-9376 to speak further about this.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-12-10

    My hydro Flask doesn't keep the water temperature for very long. The water gets cold quite quickly. Isn't it supposed to be a thermal bottle?

    Asked by: Evvvaaa
    You can test the insulation of your flask by filling it with boiling water. After about 5 minutes, feel the outside of the flask (below the neck). If you feel any hot spots, the insulation has been compromised and you are eligible for a replacement.
    Answered by: Hydro Flask Customer Team
    Date published: 2018-01-22

    does this flask come with a flip top flask

    Asked by: Hoppy
    The flip cap is made for the wide mouth flasks. The standard sized flasks caps available are the standard sized flex cap and the sports cap.
    Answered by: Hydro Flask Customer Team
    Date published: 2017-06-05

    I bought one of the aluminum pint mugs and am looking to get it engraved. Is the aluminum one anodized?

    Asked by: mike T
    At this time we do not offer any engraving services for personal or corporate orders. We suggest reaching out to trophy or engraving shops for a quote!
    Answered by: Hydro Flask Customer Team
    Date published: 2017-06-05
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