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  • TempShield™ double-wall vacuum insulation protects temperature for hours
  • Designed for ultimate portability and easy-carry comfort with the insulated Flex Cap lid
  • 18/8 professional-grade stainless steel won't retain or transfer flavors, and is tough enough for any adventure
  • BPA-free
  • Proprietary powder coat finish
  • Narrow design is easy to hold and fits into most cup holders
  • Hydro Flask lifetime warranty


View all Hydro Flask Water Bottles

REI membership


Best Use Multisport
Liquid Capacity (L) 0.53
Liquid Capacity (fl. oz.) 18
Dimensions 2.87 x 8.7 inches
Fits In Cup Holder Yes
Water Bottle Material Stainless Steel
Material(s) Stainless steel
BPA Free Yes
Insulated Yes
Bottle Opening Medium
Water Bottle Cap Type Screw Cap
Weight 10.7 ounces
Rated 4 out of 5 by from Love it except one thing The 18 oz is actually only 16.9 oz. This is frustrating because it is 1.9 oz short especially when one is counting their water intake.
Date published: 2016-03-19
Rated 5 out of 5 by from Oh My MY!!! Our family owns 4 Hydroflask products. We're in Arizona...temps in excess of 100 degrees. Ice and water in the H-flask today.....still ice in the H-flask tomorrow!! I'm NOT kidding!! Do I have any complaints? Well.....just one......a few years ago we bought 2 H-flasks with the U of Oregon logo on them. Now they're not sad we are! This product is definitely worth the investment.
Date published: 2015-09-06
Rated 5 out of 5 by from I love my hydroflask! I have had my 18oz flask for 2 years, and use it almost daily. It's keeps my ice frozen in the hot yoga room & in a hot car for hours; my tea and boiled water is still too hot to drink 5 hours later. It us amazing. I have 2, just in case I forget one in the car or in my gym bag. Love! You need to buy this product.
Date published: 2016-02-06
Rated 2 out of 5 by from Not as good as before About a month ago I bought the stainless steel flask and it does not even come close to the quality of the one I had for about three years. It does keep ice or the water cold for a day. My last kept ice for almost two and the water cold for three. Hope this is not a trend with hydro flask.
Date published: 2015-11-29
Rated 4 out of 5 by from Favorite Bottle The 18 oz standard mouth is a good all around choice for daily use. I use mine for work, driving, and smaller hikes where I don't require additional ounces. Mine holds exactly 18 and weighs 1.80 pounds full.
Date published: 2016-08-03
Rated 5 out of 5 by from I love my Hydro flask! I received mine as a gift and love it. I teach amd obviously need to drink lots of water but my water always collet off before I could actually finish it. I love that my water stays cold all day and I find I drinkore because of it.
Date published: 2016-01-05
Rated 5 out of 5 by from Love this bottle I think I may have a water bottle addiction... I also will NOT drink water unless it's cold so the purchase of the bottle was definitely a great idea. I fill the bottle up to the rim with ice and my water will stay cold ALL day, honestly. 24 hrs later, there's still ice cubes in the bottle. Only complaint is the lid is a pain in the butt to take off when you only have one hand available to do so (for example, while driving)
Date published: 2016-09-06
Rated 5 out of 5 by from New necessity I'm on my 3rd Hydroflask, not out of need but because of their wide and trendy color choices. I love my 12oz coffee mug, my coffee stays piping hot all throughout my work day... never turns bitter. I use my bright red 18oz for filtered water and my medicinal herbal tea that MUST be ingested at 18oz at a time. None of my bottles have chipped or failed me in anyway!
Date published: 2017-01-06
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What color is the Sage? Can't tell online if it's just a darker green than the forest or if it's more of a grey/black. I'm looking to customize and I'm wondering which green to go with.

Asked by: ArtSki84
​The Sage color is a darker version of the Forest green, similar to a dark, pine needle green.
Answered by: REIservice
Date published: 2017-03-13
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