Model Number: 000933-CLBK-01The versatile 500ml Ultraflask features a high flow phaser bite valve. A large 42mm cap entry aids quick and easy refilling at race checkpoints. A durable, shaped RF welded construction and flexible TPU design ensures the bottle is soft and flexible, reducing any water movement and fitting to any body shape. Lightweight at just 48 g.? The Ultraflask is 100% BPA and PVC free, and is also top rack dishwasher safe.