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  • Double-wall vacuum insulation keeps the contents hot for 6 hrs. or cold for 24 hrs.
  • The inside temperature won't affect the outside temperature of the container—that means no burned fingers from hot beverages or condensation from ice-cold water
  • Wide mouth makes it easy to fill with coffee, hot cocoa, soup or chili
  • Tough, food-grade 18/8 stainless steel is BPA free and resistant to bacteria and odors
  • Bottle fits in most car, bike and stroller cup holders and water bottle cages
  • Please note: Hydro Flask can't guarantee against leaks when the bottle is filled with carbonated beverages; keep the bottle upright


View all Hydro Flask Water Bottles

REI membership


Best Use Multisport
Liquid Capacity (L) 0.53 liters
Liquid Capacity (fl. oz.) 18 fluid ounces
Dimensions 9.8 x 2.87 in. inches
Fits In Cup Holder Yes
Water Bottle Material Stainless Steel
Material(s) Stainless Steel
BPA Free Yes
Insulated Yes
Bottle Opening Wide
Water Bottle Cap Type Screw Cap
Weight 11.1 oz ounces
Rated 5 out of 5 by from Icy all day Been using this bottle for a couple months now; mine came with the old Nalgene-style cap with the side loop. The size fits perfectly in my messenger bag. Another reviewer complained about milk going sour in it, but if you put a good amount of ice in, your water will stay cold all day. I use this over my 16oz Klean Kanteen because Hydro Flask makes a straw cap. Also, the extra 2oz in the same exterior size and the more rounded rim are advantages over Klean Kanteen. I would not recommend it for chili as the product description says; it's a narrow bottle and would be hard to get to the bottom to clean.
Date published: 2016-06-07
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 Best Waterbottle I've Spent Money On I have had my hydroflask for over a year and it has been to 8 different states, been on 12 kinds of sailboat and left on a plane (I got it back, don't worry!). It held ice all day, and night, under the blistering summer sun of Oregon, temperatures reaching past 100 degrees Fahrenheit, has yet to leak on a single flight (in the past 12 months I spent more time in airports than my house) and has survived being dropped anywhere imaginable. I thought so highly of this Waterbottle that I bought my brother the same one and he loves his just as much as I love mine!
Date published: 2016-10-03
Rated 2 out of 5 by from Drip, drip, drip... First of all, let me say I absolutely love the insulating value and the style! This keeps my iced coffee cold much longer, and the (slowly) melting ice doesn't dilute my drink nearly as fast as my old mug. So why only 2 stars? I frequently find small drips at the top rear of the lid. I know the lid is sealed correctly, and it's pretty tight. It seems like the drips are coming from the little air vent hole under the flip top. If I'm drinking water it's only a mild annoyance. However, I now get coffee on my hands, coffee rings on my desk, possible coffee stains on my clothing... I'd love it if Hydro Flask could fix this design flaw. It would be a 5 star mug!
Date published: 2017-04-11
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 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 Ice lasts all day Fill it up with some ice . Seriously. It won't melt. I get home after a long day of work and I still have ice in it, even though I have been drinking from it all day. Buy one.
Date published: 2016-06-24
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
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Does the cap stay on (no matter what)?

Asked by: janehere
The lid on the bottle is very secure and it is likely not to come off accidentally.
Answered by: REIservice
Date published: 2016-12-28

How much does the 18 oz bottle weigh empty?

Asked by: janehere
​The 18 oz. Wide-Mouth Vacuum Bottle weighs approximately 11 ounces.
Answered by: REIservice
Date published: 2016-09-01

Can you tell me if this bottle sweats when it has ice and water in it?

Asked by: cme_atx
No sweat! 
Answered by: Hugro
Date published: 2017-05-20

Is the Hydro Flask dishwasher safe?

Asked by: MegC
​We do not recommend putting this bottle in the dishwasher. Washing by hand is recommended.
Answered by: REIservice
Date published: 2016-10-13

Does the straw lid fit on this 18oz bottle?

Asked by: Karlee
​This bottle is compatible with the straw lid. The straw might need to be trimmed to fit.
Answered by: REIservice
Date published: 2017-03-29

Will this bottle fit in a standard bike water bottle cage. I'm considering using it for my flat/patch kit.

Asked by: demarcm
​This fits into most standard water bottle cages, however expect noise from the bottle and the cage when riding because it is smaller and won't have a snug fit.
Answered by: REIservice
Date published: 2017-04-13

How much does the bottle weigh empty?

Asked by: janehere
​The 18 oz. Wide-Mouth Vacuum Bottle weighs approximately 11 ounces.
Answered by: REIservice
Date published: 2016-08-16
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