Bottles

21 oz Standard Mouth

$32.95
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Gallery Image 6109
Gallery Image 6088
Gallery Image 4650

Bottles

21 oz Standard Mouth

$32.95

Lifetime

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

Quantity

Purchase via Dealer

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

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

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

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.

Pro-Grade Stainless Steel

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
  • Lifetime Warranty

    Lifetime Warranty

    We stand behind our products.

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

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™

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

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.

Pro-Grade Stainless Steel

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
  • Lifetime Warranty

    Lifetime Warranty

    We stand behind our products.

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

Details & Specs

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

Video

Reviews/Q&A

  • Reviews

  • Q & A

  • 21 oz Standard Mouth is rated 4.7 out of 5 by 697.
    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
    Rated 5 out of 5 by from Love! The color is absolutely stunning! I love the sleek look, it’s perfect for on the go and at the gym! 10/10
    Date published: 2020-03-27
    Rated 5 out of 5 by from Color is sooooo cute!! Ordered the Hibiscus colored bottle for my daughter and she loves it. It is so pretty!!! Love love love it!!
    Date published: 2020-03-24
    Rated 5 out of 5 by from Great color Love the color and got a lot of compliments on it!
    Date published: 2020-03-22
    Rated 5 out of 5 by from Great product and color I bought this for my niece and she loves it. Pink is her favorite color.
    Date published: 2020-03-19
    Rated 5 out of 5 by from amazing colors I'm very happy with my purchase i run track and field and xc and we take our water bottles outside and it keeps my water cold even though the sun is blaring out and its adorable everyone complemented the color
    Date published: 2020-03-19
    Rated 5 out of 5 by from I RECOMEND THIS i got mine a while back and fell in love with it. i have dropped mine several times and it has no dint!!!!!!!! I will definently consider this product!!!!!
    Date published: 2020-03-11
    Rated 5 out of 5 by from It’s perfect! This year all my grandchildren (8!) and getting HydroFlask for birthday presents! Each gift has been a big success!
    Date published: 2020-03-08
    Rated 5 out of 5 by from Love the size and color I use this all the time and it’s the perfect size and not clunky. I got the sports cap with it and it’s been doing a good job keeping stuff cold but I’m not surprised
    Date published: 2020-03-06
    Rated 5 out of 5 by from Perfect gift Got this for my boyfriend for Valentine’s Day and he loves it! He brings it everywhere.
    Date published: 2020-03-04
    Rated 5 out of 5 by from Best Investment I bought this bundle for my a kids as a gift. They love their hydro flask. My kids are getting bigger need more water to stay hydrated during their sports breaks. With the bundle I saved money.
    Date published: 2020-02-29
    Rated 5 out of 5 by from Perfect size, extremely cool waterbottle I bought this after losing another (competitor) water bottle during a recent trip. This 21oz. bottle is the perfect size and keeps water "extremely cool" between refills. It easily fits in my tote bag and I find that I refill it between 3–4 times a day which is a nice excuse to get up and stretch my legs. Love the color! And though I was skeptical about the cap, I think it's far superior to that of my previous bottle.
    Date published: 2020-02-28
    Rated 5 out of 5 by from i love this water bottle! i love love this water bottle i bought one for me and i love it its great
    Date published: 2020-02-25
    Rated 5 out of 5 by from Awesome water bottle!!! I purchased this for my daughter to use for school. She LOVES it. Her water stays ice cold all day. She is a very happy lil girl. Also the color choices and size choices are great. Something for everyone.
    Date published: 2020-02-21
    Rated 5 out of 5 by from I LOVE Hydro Flasks! I bought a Hydro flask About a year ago and it’s in perfect condition and it keeps my water cold also it’s cute and has great material. I totally recommend it.
    Date published: 2020-02-20
    Rated 5 out of 5 by from Keeps drinks cold or warm all throughout the day I got this for Christmas and love it so much!!!!!!
    Date published: 2020-02-20
    Rated 5 out of 5 by from Great bottle for everyday! My daughter loves this bottle! Takes it everyday to school.
    Date published: 2020-02-05
    Rated 5 out of 5 by from Love my hydro flask Bought this for my daughter and she absolutely loves it. Loves taking it to school and her dance lessons. It makes her so happy
    Date published: 2020-01-19
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  • I am getting a metallic taste in my water from the 21 oz flask. I’m surprised as it has 18/10 stainless steel. Is there anything that would get rid of this?  

    Asked by: David Werner
    We understand how frustrating treating odors can be, but we have a quick trick to battle the issue: Mix 2-3 Tablespoons baking soda with a small amount of warm water to form a paste. The paste is a nonabrasive scrub and deodorizer. Rinse the flask with warm water. Then wash with regular dish detergent.
    Answered by: Consumer Service
    Date published: 2020-02-17

    Can I use the lid with the straw for coffee in the standard mouth 24 oz bottle

    Asked by: Reacher
    Our Wide Mouth Straw Lid is compatible with all of our Wide Mouth Bottles. Unfortunately, the 24 oz bottle is a Standard Mouth and is not compatible. We have our Standard Flex Cap and Standard Sports Cap that will fit the 24 oz bottle.
    Answered by: Consumer Service
    Date published: 2020-01-27

    Where is this bottle manufactured?

    Asked by: j1234
    Manufactured in China but shipping from Southaven, MS.
    Answered by: Consumer Service
    Date published: 2019-12-30

    Is there a cap available for purchase that would allow me to use my standard mouth Hydro Flask 21oz with hot drinks? I purchased 2 hoping to use one for hot and the other for cold. However I have not been able to use hot drinks due to the cap. Frustrated

    Asked by: Limey
    We currently have two caps for the standard mouth flasks. We have the sports cap and the flex cap.
    Answered by: Consumer Service
    Date published: 2019-11-03

    The jade color was available yesterday, but is not now. Will it be available again?

    Asked by: Lindsayb
    I apologize for the issue you are having. Please contact customer service at 888-584-9376 to discuss this further.
    Answered by: Consumer Service
    Date published: 2019-10-29

    Can big pieces of ice fit in the standard mouth cap

    Asked by: unknown123456
    The mouth diameter is 1.91 inches. Ice cubes smaller than this will fit.
    Answered by: Consumer Service
    Date published: 2019-10-29

    how do i add this to my wishlist?

    Asked by: maroonscrunchie8
    Unfortunately, our website does not have an option to add to a wish list.
    Answered by: Consumer Service
    Date published: 2019-10-29

    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
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