Spiritus Systems got setup up tips in their overview video of the LBV Expander Kit... "The LBV Expander Kit is out now. The Load Bearing Vest (LBV) Expander Kit is designed to augment the 34A Split Rig Chest Rig Chassis by adding more storage real estate to the system. The LBV comes with a roll top butt pack, padded X harness system, and a sternum strap. It replaces the Back Strap and Fat Straps from a standard 34A Chest rig setup to create a fully functional platform for load carriage."