And, for that matter, the Guyot bottles themselves, while sturdy, are hardly lightweight. It is lighter to fit a titanium cup on the base of your lightweight plastic canteen (not Nalgene!). The cheap light weight canteen is a recycled quart Gaqtorade bottle, the expensive variation is a one liter Platypus. You can boil water and cook, and also keep some of your water cool, all for less weight....