Perfect for mixing BCAA drinks or powdered sports drinks, for example. Of course also suitable for water. Not suitable for shakes. Sturdy material, free from BPA. So safe to refill over and over. Leak-proof stainless steel cap that is attached to the bottle so you don't lose it. Pay attention! Each color has a different content. Pink 1 liter, gray 1890 ml, Blue 2.2 liter.