The Elite Crystal Ombra Membrane Bottle. This sporty bottle allows for a high liquid flow and best ease of use thanks to a large opening with push/pull technology. The bite valve is made from soft rubber to ensure you will also get your liquid in difficult situations or competitions. Thanks to a transparent resin material, you will always see the level of liquid and compared to polycarbonate bottles, you can also sqeeze this bottle.  Elite Crystal Ombra Membrane Bottle Features   Transparent to monitor liquid level High flow membrane valve technology High liquid flow BPA Free