The RZ3 improves upon the previous generation's aero frame bottle design,  not only does it comply with UCI regulations, but also offers an improved overall shape.

Compared to the RZ2 the RZ3 has a lower profile in order to make it a bit easier to install. RZ3 also optimises the water bottle cage, allowing you to to take out the water bottle with ease. 

Specifications
Opaque for easy viewing of contents
Soft material that is easy to squeeze
BPA free
Injection Composite Cage Mounts to any standard bottle cage bosses
Tech Specs
Bottle Construction: BPA-Free, Food safe HDPE Bottle
Bottle Capacity: 17oz (510ml)
Compatibility: Standard Cycling Bottle Cage Bosses
Cage: Injection Composite Cage
Colours: Opaque Grey
Tech Guide
Torque settings 
Mounting Bolts: 3Nm

Mfr Claimed Weight
125g