Many industries are more concerned about sustainable substitutes for packaging traditional products and services post covid 19. However, the effort towards sustainable packaging supply chain management is not as straightforward since organizations would face different hindrances. The objective of this paper is to identify the critical barriers to the implementation of the sustainable packaging supply chain (SPSC). Twenty-seven critical barriers were identified through the literature review and experts' inputs that can influence an organization in making the decision towards SPSC implementation, and then they were categorized into six main barriers. A multi-criteria decision-making technique, namely the best-worst method (BWM), has been applied to prioritize the barriers according to their influence. The findings revealed that the critical barriers were organizational barriers, followed by material barriers, economical barriers, logistical barriers, technological barriers, and independent barriers. This work would help policymakers, managers, and practitioners enhance the performance of the entire SPSC by adopting sustainability in their organization