When you're pushing your limits, you need a bottle that's strong as steel. Combining rugged reliability with a sleek and innovative high-flow design, the hydration you need will never be too far out of reach. Double-Wall Vacuum Insulation: Temperature defying chill. Lightweight Design: So lightweight you might forget it's there. Hours Cold: 14 hours. No Squeeze Required: Just grab, lift, and sip. 18/8 Stainless Steel: Tough as nails, but doesn't taste like them. High-Flow Cap: Logic-defying sipping ease. Leakproof Lockout: No spills, all thrills. Optimized Cage Fit: Fits most bike cages. BPA Free: Ride dirty, drink clean. Easy-to-Clean: Made for that post-ride convenience. Compatibility: Universal Cap System. Built tough enough to endure the scrapes and scratches that are inevitable with bike cages. The bright blue tube underneath the Podium® cap is the "Vent Tube." It is the secret to unlocking a high rate of water flow when you tip the bottle upside down to drink. The Vent Tube allows air to enter the vessel, displacing water as it flows out. Specifications: Capacity: 18oz / 500ml Dimensions: 8.82 x 2.95 x 2.95 in Weight: 11 oz.