a new method and system for transporting and sorting multiple reagent packs used in conjunction with an immunodiagnostic instrument is provided . the new system includes a multiplicity of reagent packs ; a gantry movably mounted on a rack structure for carrying a gripper mechanism , wherein the gripper mechanism has gripping jaws for engagement with the reagent pack ; a power assembly for actuating the respective movement of the gantry , the gripper mechanism and the gripping jaws ; a storage nest having a multiplicity of compartments , each adapted for storing a one of the respective reagent packs ; and a pipetting nest having a multiplicity of compartment , each adapted for retaining a respective one of the reagent packs for simultaneous pipetting . methods of using the system and a novel reagent pack used in connection with the new system are also provided .