Films used in secondary packaging that may or may not contain printing; packaging designed to cluster homogenous units that can be handled as an item called load. The load is wrapped in HEAT-SHRINK FILM or THERMO-RETRACTABLE FILM, which is subjected to a constant source of heat for a specific amount of time. The films shrink and therefore decrease in size, meaning that they adjust to the load to form a compact unit that can easily be handled. This is an ideal concept for sustainability in recycling processes and the circular economy.