Bottles

21 oz Standard Mouth

$32.95
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Bottles

21 oz Standard Mouth

$32.95

Lifetime

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

Quantity

Customize Purchase via Dealer

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

Overview

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.

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

    Tempshield

    Colder. Hotter. Longer.

    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.

  • Proprietary Powder Coat

    Proprietary Powder Coat

    Comfortable and durable.

    Our proprietary powder coat means an easy-grip, sweat-free, and extra-durable bottle that you can take anywhere.

  • BPA-Free

    BPA-Free

    Sip and enjoy.

    Our products are BPA-free for ultimate purity. Stay refreshed and worry-free.

  • Lifetime Warranty

    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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Overview & Specs

Overview

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.

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

  • TempShield

    Tempshield

    Colder. Hotter. Longer.

    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.

  • Proprietary Powder Coat

    Proprietary Powder Coat

    Comfortable and durable.

    Our proprietary powder coat means an easy-grip, sweat-free, and extra-durable bottle that you can take anywhere.

  • BPA-Free

    BPA-Free

    Sip and enjoy.

    Our products are BPA-free for ultimate purity. Stay refreshed and worry-free.

  • Lifetime Warranty

    Lifetime Warranty

    We stand behind our products.

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

Video

Reviews/Q&A

  • Reviews

  • Q & A

  • 21 oz Standard Mouth is rated 4.7 out of 5 by 410.
    Rated 5 out of 5 by from Love my hydro My sister recommended for me to purchase a Hydro Flask and I am so glad I did. It’s practical and can withstand all my day’s tasks.
    Date published: 2019-08-19
    Rated 5 out of 5 by from Great water bottle I bought this for my 11 year old granddaughter. She loves it!!!
    Date published: 2019-08-19
    Rated 5 out of 5 by from Keeps cool! I bought this about a month ago and I put cold water in it then left it in my room for like 2 days and I opened it and it was still slightly cold!
    Date published: 2019-08-18
    Rated 5 out of 5 by from Great water bottle Bought this for our family vacation and it was a life-saver! Perfect for our busy schedule - kayaking, hiking, touring. Kept our water super cold all day and love the easy to carry handle. It's now loaded with stickers from all of our favorite locations!
    Date published: 2019-08-16
    Rated 5 out of 5 by from IM IN LOVE!!!!!!!!!!!!!! I bought this a couple weeks ago and I absolutely love it. I love this bottle, it keeps my water cold and I bring it with me everywhere!!
    Date published: 2019-08-08
    Rated 5 out of 5 by from very VSCO i got this because i wanted to be a VSCO girl and i needed a water bottle for lacrosse
    Date published: 2019-08-08
    Rated 5 out of 5 by from Awsome This product is amazing it keeps your drink cold/hot for a very long time worth the money
    Date published: 2019-08-08
    Rated 5 out of 5 by from Amazing Bottle So I bought this water bottle like a month ago and at first I thought the size was a little small but oh my gosh this is the perfect amount of water I need especially when I’m at school. I love this water bottle a bunch and I’ve been wanting to give one to my friend but I don’t have money anymore but, I’ve been saving up so she can experience the same happiness I did when I first got it and i want to let you guys know that keep doing these especially in the purple and yellow cause those are some really pretty colors and wonderful bottles. Thank you so much HydroFlask for giving me smile, I really appreciate it!☺️
    Date published: 2019-08-07
    Rated 5 out of 5 by from Awesome! This bottle is great! Beautiful color and keeps drinks cold for hours.
    Date published: 2019-08-07
    Rated 5 out of 5 by from Great bottle I have the 21 oz and 32 oz - the 21 oz is much easier and lighter to use on a daily basis, fits in my car cupholder and my purse. The 32 oz. is great for when you know you need more water for a longer duration (such as going on a picnic, the beach, etc.) but much to large and heavy to carry around for daily use. Keeps water cold for hours, and is especially great during the summer, even when you leave your bottle in your car with the sweltering heat. I have the sport bottle mouth and standard - and prefer the standard. The sport mouth is a bit hard to pull out/push in, and I feel it's not as sanitary since it's left exposed, and you usually have to use your fingers to help pull/push in.
    Date published: 2019-08-06
    Rated 5 out of 5 by from Excellent Bottle I bought one for me and my daughter. They keep the drinks cold/hot for a long time. My daughter ordered special stickers to decorate hers with.
    Date published: 2019-08-02
    Rated 5 out of 5 by from broken I bought mine 2 moths ago and unfortunately it recently broke but I am very happy to get a new one
    Date published: 2019-08-02
    Rated 5 out of 5 by from Cold! It keeps your water super cold and the ice lasts up to 3-4 (for me at least) and super easy to clean
    Date published: 2019-08-01
    Rated 5 out of 5 by from No Leaks! I have bought so many re-usable bottles for the kids to take to school, and every single one has leaked. Hydro flask is the first one that hasn't so far ... have used this for a month or so.
    Date published: 2019-07-31
    Rated 5 out of 5 by from My ideal buddy I bought this product because I heard from my daughter that this is really good. So I tried it myself it’s really satisfying. So happy to have one. And I am ready to get another color.
    Date published: 2019-07-30
    Rated 5 out of 5 by from Keeps drinks cold! Even overnight, the water stays cold and fresh tasting. Beats carrying bottles of water around for a cold drink that stays cold.
    Date published: 2019-07-30
    Rated 5 out of 5 by from Love my new Hydro Flask I love the new hydro flask I got. It is light compared to other bottles on the market. It also keeps the water cool as promised for longer hours. This is a premium product!
    Date published: 2019-07-29
    Rated 5 out of 5 by from Cold water for hours! I love that the water stays cold for hours and hours and hours! This is the best water bottle I’ve ever had!
    Date published: 2019-07-29
    Rated 5 out of 5 by from Good looking water bottle!! And keeps water cold! I had been looking for a stylish and functional water bottle and this one is perfect. I received it just as my mom was hospitalized and it’s been with me ever since. Keep water ice cold and fits in my bag perfectly. Thank you! The jade color is amazing.
    Date published: 2019-07-29
    Rated 5 out of 5 by from Love the size and bottle Love hydro flask. This is the perfect size for traveling. Love it.
    Date published: 2019-07-29
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  • Are any of the water bottles dishwasher safe? 

    Asked by: SEO1
    no they are hand wash only
    Answered by: karen452
    Date published: 2019-07-02

    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" tall without it's cap. With the cap, it stands at about 9.4" tall.
    Answered by: Consumer Service
    Date published: 2019-06-07

    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: 2019-06-06

    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: 2019-07-01

    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: 2019-07-25

    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 & 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: 2019-06-15

    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: 2017-12-29

    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: 2018-07-13
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