1. Introduction to Polymer composites- Historical aspects and building blocks 2. Hybrid composites: A promising approach for potential polymeric composite design 3. Bio-based polymers, their sources, and applications 4. Recent composite formulations with bio-polymers and their characterization techniques 5. Application of diverse reinforcements in bio-composites and their characterization outcomes 6. Significances of fillers for sustainable composite reinforcement 7. Bio-fillers: Physico-chemical nature, properties and resources 8. Tribological property enhancement of polymeric composites using bio-fillers 9. Bio-plasticizers: Physico-chemical nature, properties, and resources 10. Present trends and prospects of Synthetic and Bio-plasticizers 11. Processing and application of bio-fillers/ bio-plasticizers and their effects in polymeric composites 12. Characterization techniques for bio-fillers/ bio-plasticizers 13. Selection criteria and design of sustainable green materials for specific composite applications 14. Effective utilization of bio-fillers/Plasticizers for biofilm preparation 15. Property enhancement of Bio-based polymers 16. Nanobiomaterials: A promising approach to produce polymeric composites 17. Nanofillers: nature, properties, preparation techniques, and applications 18. Economic aspects of agro-industrial wastes for bio-filler production 19. Life-cycle assessment and recovery/recycling of filler-based composites 20. Futuristic prospects of bio-based fillers for industrial application