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


Lifetime

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


Similar Bottles Products

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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 731.
    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
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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: 2020-01-01

    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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