It's arguably most important for kids to stay hydrated and always drink from a healthy, non-toxic bottle. Small and lightweight, the 12oz Kid Kanteen Sport is the natural progression for kids who are ready for a more grown-up delivery system than the Sippy Cap. The entire cap is BPA-free, super durable and the new soft silicone spout makes the Sport Cap 3.0 safe for new teeth. The cap's relief valve has been redesigned to be classroom-friendly, no chirping or whistling! The 12oz size is great when space is limited, like for a lunchbox or backpack. It's the perfect size for water, juice and other drinks.