18 oz Wide Mouth

18 oz Wide Mouth Acai Purple
18 oz Wide Mouth White
18 oz Wide Mouth Black
18 oz Wide Mouth Stainless
18 oz Wide Mouth Everest Blue
18 oz Wide Mouth Green Zen
18 oz Wide Mouth Lychee Red
18 oz Wide Mouth Orange Zest
18 oz Wide Mouth Pinkadelic

18 oz Wide Mouth


Availability: In stock

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Additional Caps & Lids
Additional Caps & Lids:
  • Hydro Flip™$4.95

    Wide Mouth Flip Lid - Blue

    Electric Blue

    Wide Mouth Flip Lid -  Green


    Wide Mouth Flip Lid - Purple

    Perfect Purple

    Wide Mouth Flip Lid - Yellow

    Banana Yellow

    Wide Mouth Flip Lid - Black


  • Wide Mouth Flat Cap$3.95

    Wide Mouth Flat Cap - Black


  • Wide Mouth Straw Lid$6.95

    Wide Mouth Straw Lid



Free Shipping on all orders of 2+ Flasks, Growlers or True Pints

Or purchase via one of our dealers:

rei backcountry moosejaw

Your portable side-kick.

For those who like a wider mouth in a smaller, easy to carry size.

Unique Product Benefits

  • Convenient Carry Size
  • Ideal for Day Packs

Universal Benefits

  • TempShieldTM Protected
  • Keeps cold up to 24 hours
  • Keeps hot up to 6 hours
  • 18/8 Pro Grade Stainless Steel
  • BPA-Free
  • Durable, sweat-free powder coat finish (or our Classic Stainless option)
  • Lifetime Warranty
  • Industry-standard wide mouth opening fits many third-party water filters
  • Compatible with Wide Flat Cap, Hydro Flip Lid and Wide Straw Lid
18 oz Wide Mouth is rated 4.75 out of 5 by 16.
Rated 5 out of 5 by from A fantastic bottle! The 18oz is the perfect size. I like to use those flavored waters, ie. Green Tea, Fruit Punch, or Grape and the 18oz bottle is perfect for this. The bottle also fits my car's cup holder and isn't overly large in any way. I had my bottle outside on a back porch table on a 95 degree day while I was mowing. I HATE MOWING. When I was done I was sweating like a sinner in church on Sunday and extremely thirsty. The outside of the bottle was almost too hot to hold onto but the tea inside was frosty and cold. That sold me on how awesome these bottles are. Once you buy the bottle all that is needed is to change out the stock cap for the Hydro Flip cap and then you are on your way. This bottle is well worth the money and your time.
Date published: 2015-09-03
Rated 5 out of 5 by from The best water bottle I've ever used! My daughter got this from me from the golf club where she works and it's changed my life! Not really, but it's wonderful for our 115 degree days her in the Arizona desert! Keeps my water cold alllll day, it's so easy to suck too! It takes no effort at all to get a nice ice cold swig with just a couple ice cubes. Seriously amazing! *and we've been through 100's of supposedly wonderful cold water bottles. Great craftsmanship, I love love it! B
Date published: 2015-08-19
Rated 3 out of 5 by from Stainless steel is less than expected I bought myself a coated, pink, 40oz bottle months ago and loved it because it keeps my water cold all day and ice stays in it for 24 hours. So at Christmas I bought my daughters the 20oz bottles because they are a little easier to handle. I bought a coated blue one and a stainless steel one. The blue works just like my 40oz, but the stainless doesn't even work for keeping drinks cold for a few hours and it sweats terribly. It probably has something to do with the coating. I wish I had known, because it's a pretty expensive bottle to buy if it only works as well as a cheap plastic bottle.
Date published: 2016-01-18
Rated 5 out of 5 by from Love it! My husband has two of the 40 oz. wide-mouth flasks for work every day; they're a bit heavier than I like myself, so I chose this size to fit in a tote bag for a day out and about. Keeps water and juice cold, and easy to drink from - like the wide mouth size very much. Have had one or two over the years that stopped insulating for whatever reason, and Hydroflask was quick to stand by their warranty with an easy replacement. Awesome all the way around!
Date published: 2015-09-04
Rated 5 out of 5 by from Cold Drinks for hours We're experiencing Indian Summer here over in California. Unfortunately, my school is rather cheap on fans/air conditioning. Luckily, this bottle has saved me hours from the stuffy classrooms! My only regret is not getting a larger size. I bought one for my boyfriend (a 32 oz one, though) and he loves it! A side note is that mold can be tricky to remove in the inside of the cap, but usually a qtip or a folded napkin can help wick them away.
Date published: 2015-09-13
Rated 5 out of 5 by from Dependable I bought one of the 18oz wide mouth hydro flasks 3 years ago and it has never leaked even when it's been dropped. I tried out many different brands of mugs and had returned them all. This one is so dependable that I have gotten them for the whole family. I guess my only problem seems to be that the little rubber stopper to seal the air hole on the snap top lid is located just right to leave a spot of coffee on the end of my nose! It has become a laughable daily occurrence. I will trade that minor inconvenience for a product that really does keep drinks hot/or cold for hours. Great product..
Date published: 2015-11-28
Rated 5 out of 5 by from Best water bottle ever! Love this smaller size, easier to hold and travel with. Using the straw lid makes it easy to "sip as you go"! Great way to keep hydrated and I love all the color options.
Date published: 2015-09-04
Rated 5 out of 5 by from This is everything that it was advertised to be! Recommended to me by a co-worker so I checked them out. The 18oz was a great value at $25. Especially considering that it's everything that it was advertised to be. Definitely faster and easier to spend a few extra bucks and get the straw add-on w/ the wide-mouth flask.
Date published: 2015-08-21
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Q & A

The Hydro Flask website says, "Industry-standard wide mouth opening fits many third-party water filters."  What water filters and where can I find them?

Asked by: WalkAndTalk
You can find one of our flasks, a 21oz Standard Mouth, with a filter from the company Clearly Filtered. Please see their website here. Have a great day!
Answered by: Hydro Flask Customer Team
Date published: 2016-01-11

Would like to personalize these for staff. Do you know a way in which to do so?? 

Asked by: Marlaina
You can check in with a local engraving or award shop. They should be able to help out with that!
Answered by: Hydro Flask Customer Team
Date published: 2016-01-11

New to hydroflask, just bought one. Thinking of using it for my green juice & smoothies. Will it stain the inside and will the smell of the juices seep into the flask & remain there for any length of time?

Asked by: Jude
We recommend cleaning your flask regularly and thoroughly with warm soapy water and allowing it to air dry. For those stubborn spots inside your Hydro Flask, mix 2-3 tablespoons of baking soda with a small amount of warm water to form a scrubbing paste. Dip the bristles of your bottle brush in the paste and work paste into affected area on the inside of your flask. Repeat as necessary until stain disappears. For more cleaning tips, visit our Care page: http://www.hydroflask.com/caring-for-your-hydro-flask/
Answered by: Hydro Flask Customer Team
Date published: 2016-01-11

Is the wide mouth the same size as the coffee/ tea?

Asked by: jars
All of our wide mouth flasks are the same size (dimensions for all bottles can be found in our FAQs: http://www.hydroflask.com/frequently-asked-questions).
Answered by: Hydro Flask Help
Date published: 2016-01-11

is both the bottle and lid dish washer safe?

Asked by: Beez
We do not recommend putting the flasks in the dishwasher because the extreme heat damages the powder coat. The Hydro Flip Lid, the Wide Straw Lid, and the Sport Cap are dishwasher safe. We don't recommend putting the Loop Caps in the dishwasher (or submerging/soaking them), because they can take on water that cannot be removed. We suggest just giving those caps a quick rinse between uses. Thanks!
Answered by: Hydro Flask Help
Date published: 2016-01-11

Is these leak proof? No mention in the details. 

Asked by: Moni
It is not leakproof!! and it doesn't just leak from the flip cap. This cap just plane leaks.  It's most disappointing in terms of the purchase. 
Answered by: JenMick
Date published: 2016-01-14

I have flask. It seems to have "locked" and I can't open it. Any suggestions?

Asked by: Chris444
If I fill mine to the very top with ice water, it gets vapor locked! As soon as I unthread it almost all the way, it "sucks" back down. I too have to have my husband help me out when I forget and fill it too full. It takes a bit of muscle to pull hard when it gets nearly unthreaded (and usually makes a bit of a mess as well). Try to see if that's the problem. Good luck!
Answered by: hmiyokop
Date published: 2016-01-13

What are the weights of all your different sized hydration flasks, wide mouth and standard?

Asked by: Backpacker
You can find our product dimensions in our FAQ section. Here's a quick reference link as well: http://s3.amazonaws.com/hydroflask/images/HF-Product-Size-Chart-for-Web.png
Answered by: Hydro Flask
Date published: 2016-01-11
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