Fourth-generation biopolymers, the most recent advancement in packaging, are becoming increasingly in demand for food packaging because of their effectiveness, biodegradability, and non-contaminating qualities when in contact with food. Biomass, biological monomers, and persistent microbes are direct sources of these biopolymers. The affordability of the ingredients needed as raw materials to produce these biopolymers, some of which come from industrial and agricultural waste, is one of the economic benefits. Plant-based protein biopolymers are notable for their exceptional mechanical properties and gas permeability. The literature on the use of biopolymers made from biomass, such as proteins, lipids, and polysaccharides, in food packaging is covered in this chapter, emphasizing their antibacterial and antioxidant qualities.