Product-Service Systems (PSS) are seen as a mean to achieve a circular economy and a sustainable consumption. Many authors point out the importance of supply network involvement to realise the sustainable effect. However, the PSS literature lack reasoning about the effect supplier integration on PSSs sustainable mechanisms. The purpose of this thesis is to develop an understanding of how supply network integration in a PSS offer affects its sustainable mechanisms and how these are affected by product and industry context. This purpose is addressed through an exploratory single case study investigating the views of several actors from an extended supply network of a focal firm within the PC industry. Somewhat surprisingly the results show that none of the involved actors have incentives to enhance sustainable mechanisms. The two reasons for this are; (1) Contextual factors of the PC industry make long term product use in PSSs economically unfavourable and (2) Despite that the SIPSS approach have the potential to support sustainability more than a normal PSS, complexity, incentive dilution, and product-service decoupling makes this potential hard to achieve. Theoretical implications of this research is that the supplier network have big impact on the sustainable potential of PSSs and that a decoupled service and product offer also have big impact on the sustainable potential. Thus these two features are important to be considered in PSS research. Practical implications are that demands on practitioners are high in regards of decision making connected to sustainability, and that there is a need for governmental support in order to enhance sustainability incentives, in industries where incentives for sustainable mechanisms are weak.