What Our Gearhead(R) Experts Are Saying:"I picked up the TWIST Bottle 590 as a second bottle for a bike that already had a base mounted, and it snapped right into the existing setup without any additional hardware. The softer material squeezes more easily than older TWIST bottles and the self-sealing cap has not leaked once through rough riding."If your bike is already running a TWIST base, the FIDLOCK TWIST Bottle 590 is the straightforward way to add a fresh bottle without buying into the full system again. This is the bottle only, no base and no connector included, designed specifically as a retrofit option for riders whose frame mount is already in place and ready to go. At 590ml it carries enough for most rides without adding unnecessary bulk to the frame. The updated ergonomic design squeezes more easily thanks to a softer BPA-free polyethylene construction, and the new cap brings a high-flow self-sealing leak-proof valve with an optional dirt cover for riding in muddy or dusty conditions. The whole bottle runs through the dishwasher without issue, keeping maintenance as simple as the rest of the TWIST system.