The leak-proof mouthpiece provides an optimum flow of liquid upon light pressure. After drinking, a spring valve closes the mouthpiece automatically. The whole system is BPA-free as well as PFC-free. Product Details Colour: transparent Weight: 20 g Dimensions: 4,5 / 4 / 2,5 / (H/W/D) Highlights of Streamer Helix Valve PFC Free High-performance materials with PFC-free dirt and water-repellent impregination: To ensure the water and dirt-repellent properties, we use a Durable Water Repellency (DWR) coating that is safe for health and environmentally friendly and completely PFC-free. This special surface treatment causes water to roll off the outside of the textiles. This keeps the material dry and nature clean.