This thesis is motivated by a desire to explore the business model centred on sharing, aiming to address critical issues of social inequality and environmental degradation. Inspired by the potential of resource-sharing to reduce overconsumption and enhance equitable access to resources, we chose to study a community-based non-profit sharing organisation Fritidsbanken to assess its impact on social justice and environmental sustainability. Through this study, we show how generosity, trust, and community engagement are embedded within the organisation's operations, enhancing justice and well-being while reducing material consumption, which also introduce new perspectives within the sharing economy. Our research highlights that the success of such initiatives is not only dependent on building trust, generosity and community engagement, but also hinges on how sharing is designed around principles of justice and equality. Consequently, the strategic design rooted in justice fosters trust and generosity, potentially driving a shift towards greater equity within the sharing economy. However, despite the positive impacts, the study also uncovers the organisation's operational challenges tied to funding and resources, reflecting broader systemic issues that hinder the pursuit of sustainability. It calls for strategic changes that support the scalability and effectiveness of community-based sharing initiatives.