Our J-Boat Hatch Launcher will fit either the J22 or J24. The launcher is designed to run on guide wires inside the cabin. The launcher has an air flow mesh bottom to help keep the spinnaker dry , Dacron sides for strength and stiffeners in the top hem so the bag retains it?s shape for easy loading. Keep your race instructions and extra gear accessible in the oversized clear, velcro pocket. The launcher clips in and out quickly for access to the cabin. An added feature is our Velcro halyard keeper which keeps the spinnaker halyard from creeping out of the bag. Dimensions are: 24? x 31?wide, 18? tall.