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21 oz Standard Mouth

£31.94
21 oz Standard Mouth

Bottles

21 oz Standard Mouth

£31.94

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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
  • TempShieldTM 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"
Product Diameter 2.87"
Product Height 9.4"
Product 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.

  • BPA-Free

    BPA-Free

    Sip and enjoy.

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

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
  • TempShieldTM 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"
Product Diameter 2.87"
Product Height 9.4"
Product Weight 11.3 oz

Technology

  • tempshield Icon
    TempShield™
  • bpa_free Icon
    BPA-Free
    • 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.

    • BPA-Free

      BPA-Free

      Sip and enjoy.

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

    Video

    21 oz Standard Mouth Promo Video
    Play Video Button

    Reviews/Q&A

    • Reviews

    • Q & A

    • 21 oz Standard Mouth is rated 4.7 out of 5 by 361.
      Rated 5 out of 5 by from Great Quality Life changing I bought this a week ago and I don’t regret it except it didn’t come the color I wanted it instead of being like a little like he came like like a light purple kind of like a lavender color
      Date published: 2019-06-15
      Rated 5 out of 5 by from perfect my ideal daily water bottle, love the lilac color sm
      Date published: 2019-06-09
      Rated 5 out of 5 by from Will Keep Sparkling Water Fizzy and Cold All Day My wife doesn’t like flat water, but loves sparkling water. We were looking for a water bottle that would keep the fizz and cold of sparkling water while we backpacked and we’re told about these by the sales people at REI. They work great.
      Date published: 2019-06-07
      Rated 5 out of 5 by from I can get ice cubes in easily! My Swell bottles were showing more than a little water, dented and wobbling. I decided to try a different shape! Very happy
      Date published: 2019-06-07
      Rated 5 out of 5 by from Only water bottle I use... I enjoy my Hydro Flask. This size is good for half a day out, and the 32 is good for a whole day. It keeps my drinks icy and refreshing for hours. It’s durable and easy to clean too. The bottles don’t sweat. IMO, these bottles are pricey but worth it because they don’t wear out EVER.
      Date published: 2019-06-06
      Rated 5 out of 5 by from The color! Bought another one in this color because I'm so sad they are retiring it!! Hydroflask, please don't retire this color!!!
      Date published: 2019-06-05
      Rated 5 out of 5 by from Great water bottles These can be brought a lot of places the only down side is that they dent easily.
      Date published: 2019-06-03
      Rated 5 out of 5 by from Great for all ages! Got myself this awesome bottle, and my baby decided he wanted it. Now I have an excuse to buy another one!
      Date published: 2019-05-31
      Rated 5 out of 5 by from Perfect bottle Bought it for my daughter. She loves it! Great color and perfect size.
      Date published: 2019-05-31
      Rated 5 out of 5 by from Love it! I wanted a hydro flask for awhile and held off on purchasing one to make sure I truly wanted it and that it wasn’t just for the hype. Well the hype is real and totally worth it! I love it!
      Date published: 2019-05-29
      Rated 5 out of 5 by from replacement w/ the lifetime warranty I bought this yesterday...and i wanted to ask if my 18 oz standard hydro flask can be replaced with a 21 oz, because i feel like the 18 oz is small, can it be replaced with the use of its lifetime warranty?
      Date published: 2019-05-25
      Rated 5 out of 5 by from Sleek bottle! I received this very sleek and trendy bottle. I have been using it for water throughout the day. It holds a decent amount of water. The bottle keeps liquid cold for several hours which is a plus. The sleek design with the black matte finish is beautiful. I have actually purchased this bottle in other colors for my family. We love it!
      Date published: 2019-05-08
      Rated 5 out of 5 by from Worth the Money! My water bottle works great! It keeps the water so cold all day long. My ice was able to stay frozen for up to six hours. Best water bottle company!
      Date published: 2019-05-01
      Rated 5 out of 5 by from Best bottle on the market I can’t say enough good things about my hydro flask. Keeps my water the perfect temperature for prolonged periods of times, sleek and ergonomically pleasing. I never used reusable bottles before but I know I’ll never need to use plastic again because of how amazing this bottle is. Worth every cent!
      Date published: 2019-04-27
      Rated 5 out of 5 by from Overall I bought this item a month a go and I am loving it. My ice last from early in the morning to late at night and it’s super portable totally recommend
      Date published: 2019-04-25
      Rated 5 out of 5 by from Great bottle Bought a month ago for gf, she loves it very much. Will definitely recommend.
      Date published: 2019-04-10
      Rated 5 out of 5 by from Really stays cold!! I was so excited to try a hydro flask after trying so many other refillable water bottles. Every single other water bottle I’ve tried to use has either tasted metallic or retained the taste/smell of dish soap from washing. I am so thrilled that my hydro does neither, and keeps ice frozen overnight! My only regret is that I purchased a smaller-size; before i purchased this water bottle, I did not drink much water throughout the day and assumed that I would only need a small water bottle.
      Date published: 2019-04-05
      Rated 5 out of 5 by from Best water bottle I bought my hydro flask a few weeks ago because I loved my first one, but I needed something smaller to fit in my bag. It keeps my water cold throughout the day, I only put ice in it in the morning.
      Date published: 2019-04-01
      Rated 5 out of 5 by from love. this. hydroflask perfect size for a school and work. love the awesome color
      Date published: 2019-04-01
      Rated 5 out of 5 by from I love my hydro flask even though it’s a bit heavy This does exactly what it says- keeps cold water cold, provides a decent volume and the handy strap makes it comfortable to carry.It is heavy- but in a satisfying sort of way, my daughter points out that full it makes a good security device!
      Date published: 2019-03-26
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    • 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: 2018-01-29

      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: 2018-01-24

      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

      Do you ship to Australia? How much is the postage?

      Asked by: sugarlotus866
      We do not ship international.
      Answered by: Hydro Flask Customer Team
      Date published: 2018-01-14
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