A reactive target system, method and kit. The reactive target system includes a substrate, a volumetrically variable retainer to be attached to the substrate, and a housing to receive the retainer and be attached to the substrate. The retainer may be a balloon inflatable from an unfilled or partially filled, undeployed state to a filled, deployed state. In the deployed state, the retainer exerts a retention force on the housing sufficient to hold a weight of the substrate and the retainer within the housing. Related systems, kits, methods, apparatuses, techniques and articles are also described.