The Vargo Funnel Flask’s attached silicone funnel can't be lost. Simply flip it up for easy filling, then fold it down to sip comfortably. The 8 oz. titanium flask holds plenty of your favorite drink while imparting no taste, odor, or chemicals. I think that means no funny metal taste in your bourbon. They say the funnel will also function as a spout to pour your booze back into the bottle, but who does that?