Most people have commented on the size and it is definitely bigger than the pictures make it out to be. A standard flask is about 8 oz, so this thing is more than double that size. That said, if you plan on taking more alcohol, 18 oz will do some pretty good damage among a few guys. This this will hold nearly 3/4 of a fifth of booze. I usually just bring this along when there's multiple people and we're staying a couple days. Otherwise, the standard 8 oz flask comes with me.
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