I have this sitting next to a regular-sized can of beans so you can get an idea of size. The bottle is 400ml. Do you know what one-half of a fifth of bottle of whiskey is? It’s 375 ml. If like me, you find typical flasks pointless for wilderness backpacking (because flasks only hold around 8oz of hootch, and anybody who is a real whiskey drinker, like me, can snort that down in 20 minutes on the first evening and be left boozeless for the rest of my time in the woods) you’re going to appreciate this little titanium bottle. Beautifully crafted. Buy two, and you’ll be able to carry slightly more than one full 750ml fifth of Mr. Booze in a very convenient-to-pack, and extremely light, container. As some others have pointed out, all of the weight of the bottle is in the cap - it is solid and robust, and I love it. The folks complaining don’t understand what they’re really asking for by wishing for a lighter, more fragile cap. The cap is perfect. The bottle is perfect. There’s nothing I’ve found that comes close to it on the market, so appreciate this one-of-a-kind find.