Perfect.  An aluminum 1 liter water bottle in heavy black.  Sigg bottles are well made, bisphenol-free, keep water cold, and function flawlessly.  This is my second one.  The first I had for years and loved, but was stolen when a thief took my bag on the train one day.  This one is just as good as the last.  Made from aluminum, they can dent if struck, but continue to function.  They are a brilliant solution to the problem of carrying water.