Get better flow by design with the 21 oz Bivo Trio the first insulated stainless-steel bottle with a flow-rate designed for cyclists. Leveraging ex-NASA engineering experience Bivo methodically developed their bottles to achieve an unmatched flow-rate without the need to squeeze. The result is a smooth consistent and enjoyable drinking experience designed for cyclists. And with top class insulation you can count on 12 hours of chill.