This chapter presents a comprehensive examination of cosmetic packaging through the lenses of functionality, consumer behavior, sustainability, and innovation. Beginning with a historical overview of materials and design, this chapter traces the evolution of packaging technologies and their cultural significance. Core functional considerations, including product protection, usability, regulatory compliance, and quality assurance, are explored alongside aesthetic strategies that shape consumer perception and brand identity. A central focus is placed on sustainability, with in-depth analysis of life cycle assessment (LCA), material impacts, and circular strategies such as refill systems, lightweighting, and recycled content. Drawing from current case studies and emerging industry data, this chapter bridges academic rigor with practical applications, equipping readers with a critical framework to assess packaging choices in a rapidly evolving, sustainability-driven beauty industry.