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  • Slim polyethylene flask with English and Metric graduations stows up to 12 fl. oz. of liquid, without unpleasant aftertastes
  • Flask fits snugly into a durable polycarbonate sleeve with easy snap on/off assembly, offering additional insulation and protection
  • Slender profile transports and stores easily
  • Twist-off valve-seal cap closure prevents leaks
  • Removable shot cap snaps on/off of closure cap for handy 1 fl. oz. measuring
  • Nalgene flask weighs only 4.3 oz.; remove the insulation sleeve and the shot cap and the weight drops to 1.9 oz.
  • Hand wash in warm water with a mild dishwashing detergent

Made in USA.

View all Nalgene Flasks

REI membership


Best Use Backpacking
Liquid Capacity (L) 0.35 liter
Liquid Capacity (fl. oz.) 12 fluid ounces
Dimensions 8 x 4 x 1.5 inches
Water Bottle Material Hard Plastic
Material(s) (Flask) polyethylene / (outer sleeve) polycarbonate
BPA Free Yes
Insulated Yes
Bottle Opening Narrow
Water Bottle Cap Type Screw Cap
Weight 4.3 ounces
Rated 5 out of 5 by from Great Product! I used this flask for over seven years. It went with me all over the world including South America, Alaska, Afghanistan (three tours) and all over the U.S. I used it for several different beverages and it never affected the taste and never leaked. I always washed it with Dawn dishwashing liquid and a Cambelbak brush. Then one day I was in a hurry and put it in the dishwasher. The high heat warped the mouth of the bottle and it would not longer seal. It also warped the sleeve/cup. I'm replacing it right away. This thing is a high quality, well thought out great value and will give you years of service as long as you wash it in accordance with the manufacturer's guidance. If you're considering other plastic flasks, you can stop looking. You will not be disappointed with this one.
Date published: 2012-11-11
Rated 5 out of 5 by from Good flask I filled this flask half full with Talisker 2 months ago, and the single malt scotch is still fresh today. There is no plastic taste, the whisky tastes the same as it does fresh from the bottle.
Date published: 2012-08-17
Rated 5 out of 5 by from Love these We have two of these. They are perfect for carrying adult beverages for relaxed recreation. Never worry about leaks, measuring is easy, and the cover doubles as a glass.
Date published: 2012-08-11
Rated 2 out of 5 by from I Really Like this Flask but... after the first couple of uses on 4-day trip the snap on/off "durable polycarbonate sleeve" that provides significant protection for the softer flask bottle just falls off because the small horizontal protrusion on the bottle doesn't catch the nubs on the sleeve. Other than that It really does do everything the 5-star reviewers says; a real shame. It's in my "return pile" from the trip. I'm torn on the recommendation.
Date published: 2014-08-19
Rated 5 out of 5 by from Never lose a drop of your favorite night cap. I bought the Nalgene flask to replace an older different brand flask that I had been using. The older flask had started to leak at elevations starting around 6000ft. I am happy to report that the Nalgene flask worked perfect. The Nalgene Flask is strong, and dose not leak!!!!!! I took it up to 9200FT in elevation and it was perfect. I will have it with me on every trip I take from this point on. Thank you REI for carrying everything we need to get outdoors and enjoy life.
Date published: 2016-08-19
Rated 5 out of 5 by from Excellent for snowmobiling Perfect size and shape to be tucked into snowmobile windshield bag or jacket pocket. Nice to have a flammable drink when out in the Arctic temps in the Pacific Northwest this year, from warming up internally to starting a fire. ❤
Date published: 2017-01-13
Rated 4 out of 5 by from Cool little addition. I was looking for a little gift and ended up getting one for myself in addition. The blue part is actually a slip-on case that serves as a cup. The blue cap is a shot cup, and there is an inner screw-on. It's light and strong, and unlike metal ones, there is no staining or rusting and the mouth is wide enough. One possible issue is that the blue sleeve pops off the body very easily, and I would have to be careful not to grab it by the shoulder or the neck. Now I can take a little wine for the overnight backpacking.
Date published: 2017-03-29
Rated 3 out of 5 by from Blue outer casing falls off Overall it works good, but the blue outer casing just falls off. It's on there "for protection" so I'm thinking of just gluing it on. It did it's job though, held liquids and didn't leak on my canoeing trip.
Date published: 2016-07-20
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Can this flask be placed in a freezer?

Asked by: ccclimb
We would not recommend putting the flask in the freezer as it will more than likely crack.
Answered by: REIservice
Date published: 2015-09-20

Can you confirm that this product BPA free? I don't see anything in the product information that addresses this.

Asked by: gogowlight
Yes, this flask is BPS free. This and other information is found under the "Specs" tab.
Answered by: REIservice
Date published: 2016-08-12
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