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Standard Mouth
21 oz Standard Mouth w/ Sport Cap
$26.96
Regular Price $35.95
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Standard Mouth

21 oz Standard Mouth w/ Sport Cap

21 oz Standard Mouth w/ Sport Cap is rated 4.4 out of 5 by 466.
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$26.96
Regular Price $35.95
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

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<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.

21 oz Standard Mouth w/ Sport Cap Lifestyle Image
21 oz Standard Mouth Bottle w/ Sport Cap | 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, 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
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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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 Keep it cold Left inside car in a hot summer and keeps my water cold still.
Date published: 2020-08-09
Rated 5 out of 5 by from Cold Machine Keeps water cold, more so when flask is chilled before using. Silicone boot is nice for protection but makes bottom too large for many common drink holders.
Date published: 2020-08-05
Rated 5 out of 5 by from Hydro Flask 21 oz Standard Mouth w/ Sport Cap I bought a pair of these to use around the house and for bike riding. I haven't been riding lately but I do like how the bottles hold their temperature.
Date published: 2020-08-05
Rated 5 out of 5 by from Great item! I bought this two months ago and so glad I did! It’s great to use all day long.
Date published: 2020-08-04
Rated 5 out of 5 by from Love it so portable I thought I wouldn’t need it but once I got it I loved it so much, it’s also great for keeping cool and hot for sooooo long
Date published: 2020-08-02
Rated 5 out of 5 by from Love Love this for keeping my water cold......::::.....
Date published: 2020-08-02
Rated 5 out of 5 by from Perfect This one is the perfect size for keeping with you all day.
Date published: 2020-07-31
Rated 5 out of 5 by from Keeps ice for over 24 hours I bought this for my husband who is a bicyclist and does some 100 mile rides and he loves it
Date published: 2020-07-29
Rated 5 out of 5 by from BEST CAP cap is 10/10, i drink so much more water now because i love my bottle!! so sturdy and my ice lasts well over 24 hrs. will buy again.
Date published: 2020-07-28
Rated 5 out of 5 by from Love, Love, Love it! I bought my wonderful hydro flask in April and use it everyday for tennis and other sports. Great bottle, great colors! All my friends refused to get them because they thought they were to expensive, but I got one and convinced them to get one too. It is so worth the money. Hydro Flask's rock! - Amy and Mary
Date published: 2020-07-28
Rated 5 out of 5 by from Just the best ! I bought several hydro flasks for my granddaughters, they use them for their cheerleader practice. When we get home I wash them out . The liquid is always still in the e and cold, so I got one for myself. I just enjoy waking up during the night to having ice cold water to drink my medication. Planning on getting a drinking cup for use during the day!
Date published: 2020-07-24
Rated 5 out of 5 by from Keeps That Water Cold!! I bought this for my daughter’s birthday and she loves it. It keeps her water cold even through New England heatwaves. I’m also glad I ordered directly through Hydro Flask since I got it on sale and fast shipping!
Date published: 2020-07-23
Rated 5 out of 5 by from Replace all other drink vessels now This is my 3rd hydro flask, nothing will keep your beverage cold longer!
Date published: 2020-07-19
Rated 5 out of 5 by from Cold water! I bought this for my husband and he loves it. Keeps water super cold even in the texas heat.
Date published: 2020-07-19
Rated 5 out of 5 by from Love Loving the color of my hydroflask! Perfect size too.
Date published: 2020-07-18
Rated 5 out of 5 by from Love the color and the Sport Cap I bought this HydroFlask explicitly for the Sport Cap, as the twist cap for my other HydroFlask was incredibly tedious to take off and put back on while wearing boxing gloves. I can easily open the cap with my front teeth and drink much more easily than before. The color is also a lovely cornflower blue, a bit more pale and muted than in the photos. I would definitely recommend it!
Date published: 2020-07-17
Rated 5 out of 5 by from Love it! I ordered my first one a couple of months ago and couldn’t be happier. It’s great looking and keeps the contents cold for a really long time. I had bought three of them last Christmas as gifts for my family and they all commented on how great they were which lead to my getting one and have since bought 3 more but customized them for a more personal touch I.e. school colors. Just wish you had an emerald green color offering. Love them!
Date published: 2020-07-17
Rated 5 out of 5 by from HYFR My girlfriend got back with me, recommend to all the single guys out there
Date published: 2020-07-14
Rated 5 out of 5 by from Keeps my liquids cold all day The 21 oz is a great size and so lightweight. I want the larger size too.
Date published: 2020-07-13
Rated 5 out of 5 by from Love my new yellow hydro flask! Perfect size for water hydration on the go or just at home.
Date published: 2020-07-13
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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 &quot;frost&quot; 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&rsquo;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.&nbsp;

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?&nbsp;

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.
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  1. Small Tag Along Bottle Sling
    $17.48
    Regular Price $34.95
    Small Tag Along Bottle Sling
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  2. Standard Mouth Flex Cap
    $7.46
    Regular Price $9.95
    Square - 600x600
    Colors Available