The first stainless-steel bottle with a flow-rate designed for cyclists. Leveraging the experience of an ex-NASA engineer, the Bivo Duo was methodically developed to achieve an unmatched flow-rate without the need to squeeze. The result is a smooth, consistent and enjoyable drinking experience you'll love. High quality stainless steel and food-grade silicone pair to ensure you’ll only taste your water: never plastic or mold. The Bivo Duo was also designed to fit in most bike bottle cages comfortably and securely.