While sustainability efforts in the polymer industry have traditionally focused on high-volume applications such as packaging, automotive, and construction, a significant yet underexamined category—miscellaneous polymer products remains largely excluded from mainstream sustainability discourse. This category includes a broad range of consumer and industrial goods such as household items, electronics casings, footwear components, furnishings, adhesives, and additive manufacturing filaments. These products are often characterized by small-scale production, heterogeneous material compositions, complex geometries, and limited infrastructure for recovery and recycling, posing unique sustainability challenges. This chapter explores strategies for advancing sustainability in miscellaneous polymer products by evaluating their environmental footprint through life cycle assessment, highlighting resource use, emissions, and end-of-life constraints. It examines recent innovations in material science, including bio-based and recycled alternatives, and outlines design-for-sustainability (DfS) principles such as lightweighting, durability, and modularity. The chapter also analyzes the influence of regulatory frameworks, eco-labels, and circular business models such as product-as-a-service and buy-back programs that aim to decouple resource use from product value. Key barriers such as performance tradeoffs, consumer behavior, lack of harmonized standards, and fragmented supply chains are critically assessed. The chapter further identifies future research directions, including advancements in green polymer chemistry, AI-driven design tools, and interdisciplinary collaboration as enablers for scalable, systemic change. By focusing on this diverse yet impactful product category, the chapter provides a roadmap for aligning miscellaneous polymer products with circular economy goals and minimizing their environmental burden across the value chain.