21 oz Standard Mouth
$32.95

21 oz Standard Mouth

21 oz Standard Mouth is rated 4.7 out of 5 by 757.
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$32.95
Size Chart
Hydro Flask Pack Size Chart
Available Sizes S / M M / L
Torso
Measurement
18 - 19 in 19 - 22 in
43 - 48 cm 48 - 56 cm
Hip
Measurement
22 – 46 in 26 – 46 in
56 – 117 cm 66 – 117 cm
  1. 1. Torso Measurement

    • A. Bring your chin to your chest and feel for the most prominent bony bump where the slope of your shoulders meets the back of your neck. This is your C7 vertebra, and the top of your torso measurement.

    • B. On each side of your body, feel for the top of your hip bones, just below the sides of your ribs. With fingers pointing forward and thumbs pointing backward, draw an imaginary line between your thumbs. This is the bottom of your torso measurement.

    • C. Stand up straight and have a friend with flexible measuring tape measure the distance between your C7 vertebra and the imaginary line between your thumbs. That’s your torso measurement. If you are between pack sizes, go with the smaller size.

  2. 2. Hip Measurement

    While your torso measurement is the best indicator of your pack size, it’s still important to check your hip size when using a hipbelt. To find your hip measurement, wrap a flexible tape measure around the top of your hip bones, just below the sides of your ribs. This measurement is slightly higher than your waistline

<h2>Your perfect travel companion.</span></h2> <p>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.</p>

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.

21 oz Standard Mouth Lifestyle Image
21 oz Standard Mouth Insulated Water Bottle | Hydro Flask
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Features
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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.

TempShield
Pro-Grade Stainless Steel

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.

Cold Flow System
Details
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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
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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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 I love the color! My favorite color is coral, and that’s basically what color this flask is! It keeps water cold for a while, and even keeps coffee hot! It is super easy to carry around. All in all, it’s a great-sized flask that is very helpful so I can have cold water always.
Date published: 2020-05-28
Rated 5 out of 5 by from ok love it!!! new favorite water bottle. motivates me to drink more loll
Date published: 2020-05-28
Rated 5 out of 5 by from Great Got my daughter one she loveddd it so glad I got it for her
Date published: 2020-05-27
Rated 5 out of 5 by from Love this bottle! I love this bottle! Perfect size! Keeps my water cold and refreshing! I will always buy all my products like these from Hydro Flask and no one else!
Date published: 2020-05-26
Rated 5 out of 5 by from Color is beautiful! I bought this about a year ago and I put everything in it. So useful for so many things
Date published: 2020-05-25
Rated 5 out of 5 by from Best for those that don’t drink water I feel like I’m forcing myself drinking water but this is so convienant and sustainable. I love how cute it looks and the color. Would purchase again
Date published: 2020-05-25
Rated 5 out of 5 by from Amazing! I was really hesitant to buy a Hydroflask, mainly for the price, but it was so worth it. It keeps my water cool and it’s so easy to carry. I was also worried about having to twist to open it every time, it really hasn’t been an issue at all. The design is so nicely made too.
Date published: 2020-05-24
Rated 5 out of 5 by from Perfect for my needs. I love this bottle. I put water in it before I go to bed, and when I wake up it's still cold. I use the sports cap and love not having to unscrew a lid. Very convenient!
Date published: 2020-05-23
Rated 5 out of 5 by from Great insulation I bought it about a month ago and I’m happy with the color :)
Date published: 2020-05-22
Rated 5 out of 5 by from beLLa/rYssa’S gReaT giFt I ordered this gift for my niece on her birthday and also got her sister one and two other products
Date published: 2020-05-21
Rated 5 out of 5 by from Great product Daughter so loves the new colors. Can't wait for school to start
Date published: 2020-05-20
Rated 5 out of 5 by from Present for a Friend I got this water bottle for a friend who's a nurse because she was drinking out of small plastic cups at work, and didn't have a good bottle that was easy to disinfect after work. She chose the color and the size, and she freaking LOVES it!
Date published: 2020-05-14
Rated 5 out of 5 by from Amazing features I bought this a couple monthes ago, and couldn’t be happier. I use it for everywhere and everything!
Date published: 2020-05-14
Rated 5 out of 5 by from My hydro flask I had a 32oz frost hydro flask and then it kept getting dented so I was like I think I should just buy a new one. But I do think hydro flasks a pretty expensive.
Date published: 2020-05-03
Rated 5 out of 5 by from 21 oz black Hydro regular cap I love hydroflask company products! I will not trust any other brand. Worth the price. My wqter stays cold for HOURS! They are durable and strong non fading products. Worth your money. No regrets. (Butterfly not included) lol.
Date published: 2020-04-30
Rated 5 out of 5 by from She loves it This was a gift for a 10-yr old and of course she loves it. It’s the perfect size for her, not too heavy. And she loves the color.
Date published: 2020-04-26
Rated 5 out of 5 by from Amazing Water Bottle I bought this a mouth ago and I'm in love with it. It keeps my water cold for hours especially when I put ice cubes also due to the mouth of the bottle its easy to put ice cubes in. Also the color is very pretty I thought it was going to be a gray color its more of a super light version lilac.
Date published: 2020-04-21
Rated 5 out of 5 by from Super convenient! Got this two weeks ago after having a coffee hydro. Got it for the color and the handle and I really love it!
Date published: 2020-04-17
Rated 5 out of 5 by from Great water bottle. Really love this water bottle. You will not be disappointed. Bought for my daughter in college. She loves it.
Date published: 2020-04-17
Rated 5 out of 5 by from WOW! I was given this as a Christmas present and I love it soooo much! I was given "frost" in the 21Ounce and it is the perfect size for my needs. I love how this actually works and keeps water/ice Ssooooo cool! I actually had to tip out the tea that I once put in one because it just wasnt cooling down enough to drink! The only thing I dont like is that they dent and the paint chips super easily, so you have to be super careful!
Date published: 2020-04-15
Rated 5 out of 5 by from Great bottle I bought this for my son who plays sports. None of his other bottles keeps his water cold for long, but his hydro flask.
Date published: 2020-04-15
Rated 5 out of 5 by from Love the color I bought this a month ago for my daughter to take everywhere that wouldn’t spill in her backpack or my car. Love the color fog. It’s perfect size for a 7 year old.
Date published: 2020-04-13
Rated 5 out of 5 by from Quality makes the difference Very nice bottle. It looks and feels like a quality piece.
Date published: 2020-04-12
Rated 5 out of 5 by from Very Durable! I bought this for my daughter and she loves it !!!!!
Date published: 2020-04-11
Rated 5 out of 5 by from Love my coffee flax Bought , love it. Keeps liquid hot for hours, enjoy that i can drink my coffee leave it and come back still hot. Would reccomend it .
Date published: 2020-04-09
Rated 5 out of 5 by from Love! Bought this a while back, love it, would purchase again! The color is even better in person and the quality is great!
Date published: 2020-04-08
Rated 5 out of 5 by from Perfect fit!!!! I just love my new hydro flask!! It‘a matte black and it’s a perfect size for when I’m running a quick errand or doing a quick 15 min workout.
Date published: 2020-04-06
Rated 5 out of 5 by from Never drinking water any other way again! I bought this a few weeks ago and it was the best decision I ever made in terms of drinking water. I love how cold my water stays- even after HOURS of being left in direct sunlight it’s still cold!! Not only that but I find myself drinking more water now because it’s more enjoyable so cold out of the hydro flask! I would recommend this to anyone.
Date published: 2020-04-03
Rated 5 out of 5 by from Pretty good I bought this bottle almost a year ago and it’s worked well! I can put ice in it before I leave in the morning and there is still some left when I come home 6 hours later! It also works well with hot chocolate and keeps it nice and warm! The only downside I’ve found is it’s very easy to mark it up. (Small streaks of paint from my walls, scratches, one small dent) Overall, it’s a very good water bottle that can hold its temperature!
Date published: 2020-03-31
Rated 5 out of 5 by from So well made Keeps water super cold, my entire family has one and I bought my friend one too bc she loved mine so much. Lasts such a long time.
Date published: 2020-03-29
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Questions

Can I use the bottle to keep milk cold? I know some metals are not recommended to be in contact with milk.

Asked by: Jsyd
Yes, milk should be fine! We would just suggest taking extra care with cleaning after putting anything besides water in the flask.
Answered by: Consumer Service
Date published: 2019-10-28

If I order 10 bottles, can a logo be imprinted on them?

Asked by: Sandy33
No. We recommend that you take them to a local engraver of your choosing.
Answered by: Consumer Service
Date published: 2019-10-27

Does the height mentioned above count the cap as well or is it just the height of the flask without the cap?

Asked by: jjff277
The bottle stands at about 8.5&quot; tall without it's cap. With the cap, it stands at about 9.4&quot; tall.
Answered by: Consumer Service
Date published: 2020-02-16

I have mold in the bottom of my bottle. How do I get rid of it? How often do you recommend washing?

Asked by: Sallybear
A good cleaning tip is to take about a teaspoon of baking soda and some water to make a thick paste. Use a bristled bottle brush to scrub the entire flask thoroughly. Then fill the flask up with boiling water. Leave the cap off the flask. Allow the flask to soak in the baking soda/water mixture until the water inside the flask is cool to the touch. Finally wash and rinse the flask with dish soap and allow it to fully dry.
Answered by: Consumer Service
Date published: 2019-08-24

What is the material on the inside made of? And is there any toxic metals or other toxic chemicals used to manufacture these?

Asked by: Marigold4
18/8 and 18/10: These are the two most common grades of stainless steel used for food preparation and dining, also known as Type 304 (304 Grade) and are part of the 300 series. The first number,18, refers to the amount of chromium present and the second represents the amount of nickel. For example, 18/8 stainless steel is comprised of 18% chromium and 8% nickel. 304 grade stainless steel is also comprised of no more than 0.8% carbon and at least 50% iron. The chromium binds oxygen to the surface of the product to protect the iron from oxidation (rust). Nickel also enhances the corrosion resistance of stainless steel. Therefore, the higher the nickel content, the more resistant the stainless steel is to corrosion.
Answered by: Hydro Flask Customer Team
Date published: 2019-12-02

Can you keep a hydro in the refrigerator with water in it?

Asked by: Teddy2
You can put it in the refrigerator. It really does not help. The double vacuum is what keeps the beverages hot and/or cold.
Answered by: Hydro Flask Customer Team
Date published: 2019-08-27

Have standard sport cap for my 21oz flask. Purchased Jan 2017. Noticed recently a bubbling sound as I drink. Should there be this sound? Maybe it's always been there &amp; I've just become aware of it. Or should it be quiet? In which case I'll buy new cap.

Asked by: MarieD
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: 2020-01-11

Can it be placed in the freezer?

Asked by: Jazzie
We do not recommend putting the flask in the freezer.
Answered by: Hydro Flask Customer Team
Date published: 2019-09-14

Does this drink bottle dent easily when you drop it and would you recommend the boot otherwise?

Asked by: sugarlotus866
The flask can become dented if it is dropped. The boot does offer a little more protection, but depending on how it hits, it could still dent.
Answered by: Hydro Flask Customer Team
Date published: 2019-08-24

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: 2019-08-24

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: 2019-07-30

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?&nbsp;

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: 2020-04-16

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?&nbsp;

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: 2019-09-10

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 &quot;TempShieldTM insulation eliminates condensation&quot; 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: 2019-11-10

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 &nbsp;2 inch opening (roughly). Where Can I buy a new caos.&nbsp;

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.&nbsp; Thanks,&nbsp;

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? &nbsp;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
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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.
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