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Standard Mouth
21 oz Standard Mouth w/ Sport Cap
$35.95
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Standard Mouth

21 oz Standard Mouth w/ Sport Cap

21 oz Standard Mouth w/ Sport Cap is rated 4.3 out of 5 by 611.
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$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.

Hydration on the go
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.

Proprietary Powder Coat
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 2.81"
Height 10.4"
Weight 11.3 oz
Technology
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Lifetime Warranty
Lifetime Warranty

We stand behind our products.

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

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:

  • 122 Nonprofits supported nonprofits.
  • $1.9 million Dollars donated donated.
  • 55,958 Bottles donated bottles.
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    $9.95
    Standard Mouth Flex Cap - Carnation
    Colors Available
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    $34.95
    Hydro Flask Small Tag Along Bottle Sling - Mist
    Colors Available
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Reviews
Rated 5 out of 5 by from It was great until my ex stole it This hydroflask in the color rain is beautiful. I would update about the usage but my ex took it to goodwill. :(
Date published: 2021-10-17
Rated 5 out of 5 by from Love it! Love my bright pink HydroFlask. It’s just the right size and the spout makes it easy to drink from while I’m in the treadmill. Highly recommend.
Date published: 2021-09-26
Rated 5 out of 5 by from Great gift Gave this as a birthday gift and she loves it. Bought the 21os flask, blue. Nice color
Date published: 2021-09-21
Rated 5 out of 5 by from The best bottle, ever! I purchased my Hydro Flask almost 3 years ago for several of my missions trips to Africa. The best investment I have ever made. In the slums of Nairobi, up country, or on safari, my flask kept my liquids cold all day long and into the night. {people were amazed. The construction is great, and I've banged it around a lot. You are a great company with a wonderful product. I will be bringing flasks back with me to Africa. Thank you.
Date published: 2021-09-20
Rated 5 out of 5 by from Hydro flask This is our 2nd batch of having a hydro flask. Several years apart. We replaced because we wanted new colors. Even the old ones still work well.
Date published: 2021-09-03
Rated 5 out of 5 by from Perfect for the car! I have been a long-time fan of the 32oz hydroflask, taking it to many a competition, but it didn't fit in my car cup holders. This one fits, and is great to take on my daily commute!
Date published: 2021-08-12
Rated 5 out of 5 by from Sport Cap Love it! I am such a dork that without it, I was always spilling my drink all over me with the big mouth opening!
Date published: 2021-07-15
Rated 5 out of 5 by from BEST GIFT EVER RECEIVED My boyfriend Loves it! I’ve had mine for a few years and he never really used it. We live In AZ and it’s always HOT. Typically you can’t leave a beverage in the car and drink it thereafter, until NOW. Hydro Flask bottle with sport cap allows a cool drink after returning to the car after shopping. BF didn’t believe me. Bought him one for his bday. Now he never leaves home without it!
Date published: 2021-06-29
Rated 5 out of 5 by from Keeps ice…ice! Our young sons have been begging to HydroFlasks for a while now (they’re young but they train as youth wrestlers and they train super tough). I finally caved and bought them each their own. I’m so impressed with how cold these hydro flasks keep water, I’m going to buy larger versions for myself and my husband. Thanks for making a quality product!
Date published: 2021-06-28
Rated 5 out of 5 by from Great water bottle I really like my water bottle. It keeps the water cold. It has encouraged me to drink more water as I fill it up several times during the day. I knew I would like it because I have the coffee bottle but it has exceeded my expectations.
Date published: 2021-06-23
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Questions

Will this bottle fit in a bicycle holder?

Asked by: paodrea
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.
Answered by: Consumer Service
Date published: 2021-06-08

Are your bottles and lids dishwasher safe? What are the diameters of the standard and wide mouths?

Asked by: Poochie
No, however the bottles on our site currently are all dishwasher safe. The wide mouth diameter is 3.58 inches and the standard mouths are 2.81 inches.
Answered by: Consumer Service
Date published: 2021-05-19

Is this the hydro flask 2.0?

Asked by: aubz
Yes
Answered by: Consumer Service
Date published: 2020-11-11

When is the frost 21oz standard mouth bottle coming again. Is it going to be on sale again when it comes out.&nbsp;

Asked by: Andrea0412
Hello, I do apologize for the longer response time! We are not able to ensure if or when a color will come back!
Answered by: Consumer Service
Date published: 2020-11-05

So I have been wanting to buy I hydro flask for I really long time. So my dad told me I could buy one I like the 21 oz standard mouth bottle w/ sport cap l Hydro flask. So this is my question does the hydro flask 21 oz come with the sport cap or no lid.&nbsp;

Asked by: Andrea0412
Hello, I do apologize for the longer response time! You would want to make sure you select the correct bottle on the website. They do have the option to include the sports cap!
Answered by: Consumer Service
Date published: 2020-11-05

Does this bottle fit in most car cup holders?

Asked by: AC3215
Hello, I do apologize for the longer response time! Yes, the standard bottles tend to fit more in the standard size cupholder!
Answered by: Consumer Service
Date published: 2020-12-13

Per your answer on china vs USA manufacturing which lids are made in the USA?

Asked by: Randomman
All of our products are manufactured in China, but distributed from our US warehouse.
Answered by: Consumer Service
Date published: 2020-11-05

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: 2020-08-27
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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:

  • 122 Nonprofits supported nonprofits.
  • $1.9 million Dollars donated donated.
  • 55,958 Bottles donated bottles.
You May Also Like
  1. Standard Mouth Flex Cap
    $9.95
    Standard Mouth Flex Cap - Carnation
    Colors Available
  2. Small Tag Along Bottle Sling
    $34.95
    Hydro Flask Small Tag Along Bottle Sling - Mist
    Colors Available