Halcyon Infinity 30-lb BC System w/ SS backplateHalcyon Infinity 30 lb BC System w SS backplate The Halcyon Infinity system is not your typical buoyancy compensator. In fact, it establishes a new standard for single cylinder, recreational diving. The Halcyon Infinity incorporates all of Halcyon's premium features into a high performance, flexible diving system. The Halcyon Infinity comes standard with Cinch Quick Adjust, Deluxe shoulder and backplate padding, and ACB 10 releasable weight pockets.