The Pulse v2 is the latest in the Pulse line, culminating the best aspects of
previous versions, and incorporating the same waterproof technology from
the Swell Mod. We’ve created an excellent bottom fill system for the bottle,
that keeps it locked in place, and directly in line with the 510 to eliminate
potential issues with the plumbing inside the mod to transfer juice from one side
to the other. With refined lines and ergonomics.