The Castelli Elite Fly Water Bottle is one of the lightest bottles available. This is why it is favored by professional cyclists all around the World Tour. At only 54 grams (550ml), variable thicknesses around the bottle maximize weight savings. Plus, it is soft and easy to squeeze. Features: Lightweight easy squeeze design Only 54g (550mL) BPA free Specifications: Size: 550mL Material: BPA-Free Plastic Weight: 54g Color: Red (Castelli)