A fully automated packaging process, abbreviated BFS, in which a plastic container is blow-molded, filled with sterile product, and sealed in one continuous, fully enclosed operation that keeps human hands out of the process entirely. The technique dominates the packaging of ophthalmic drops, respiratory drugs, and an increasing range of liquid foods and nutritional products, because the closed system virtually eliminates contamination risk. The container forms from extruded plastic parison, fills within seconds, and seals before ever meeting the outside world. For food applications it offers extended shelf life without preservatives and single-serve convenience. The machinery is complex and costly, but where sterility and scale matter, blow-fill-seal sets the standard that other aseptic methods are judged against.