Gear Review GSI Outdoors Flask - 18fl. oz. 4 5 Community Rating | 11 Reviews $9.90 Item # GSI0150 One Color, One Size ($9.90) Quantity Add to cart View full product page Tech Specs Material: BPA-free resin Volume: 18 oz Lid(s): 1 Claimed Weight: 113 g Recommended Use: backpacking, camping Manufacturer Warranty: lifetime 5 5 Love it Michael Kisow Member since Dec 13, 2008 Posted on May 2, 2010 Enough for the entire crew. Sturdy and takes freezes well. This thing is big. Look at the photos I uploaded. (2) Wrayann Member since Aug 17, 2010 Responded on August 17, 2010 Great photos of the true size! Just found my husband's next bday gift. Thanks! (0) View More Details on GSI Outdoors Flask - 18fl. oz.