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Product Service Systems have the potential to align businesses' financial incentives with environmental objectives. Research on the circular economy and non-ownership consumption suggests that such offerings benefit from network effects, which motivate system adoption and system use by consumers. However, there is a need for empirical analyses of these effects based on field data capturing actual behavior. This paper leverages a large field dataset from a system for reusable takeaway food containers to evaluate the effect of increased geographic network density of participating restaurants on (a) the acquisition of new users and (b) the frequency of system use. Based on fixed effects Poisson panel models, this paper finds statistically significant and economically meaningful positive effects of increased geographic network density on acquiring new users. Notably, marginal effects of increased geographic network density on user acquisition diminish as networks get denser. In terms of frequency of use, no consistently significant effects of geographic network density are identified. These results contribute to the literature on network effects in multisided markets and in the circular economy by presenting field evidence of indirect, cross-side network effects on consumer adoption. Moreover, findings encourage businesses and policymakers to establish dense local networks of circular economy offerings. [ABSTRACT FROM AUTHOR]