You are using a web browser we don't support. Please use the latest version of one of these browsers.

Mozilla Firefox

Google Chrome

Apple Safari

Microsoft IE

Back to top
Slate Blue
Slate Blue

Please select a color/size.


  • 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

The REI Difference

100% satisfaction guaranteed

We stand behind everything we sell. If you are not satisfied with your REI purchase, you can return it for a replacement or refund within one year of purchase.

REI's guarantee doesn't cover ordinary wear and tear or damage caused by improper use or accidents.

If your item has a manufacturing defect in its materials or workmanship, you can return it at any time. See our limited warranty.

Gear & advice you can trust

At REI, we live and breathe the outdoors, and we're passionate about sharing our expertise with people of all skill levels. Whether you're new to the outdoors or a seasoned explorer, we'll take the time to understand your needs and help you find the right gear for you.

10% annual member refund

Anyone can shop at REI, but for a one-time $20 fee you can become an REI member and enjoy a lifetime of benefits. These include an annual member refund, typically 10% back on eligible purchases.*



*10% is typical but not guaranteed. Your refund is based on eligible purchases, which exclude REI gift cards, services, fees, REI Adventures trips, REI Garage, and discounted items. Learn more