Halcyon Infinity 40-lb BC System w/ AL backplateHalcyon Infinity 40 lb BC System w AL 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.