This study explores the practical and organizational dimensions of regional collaboration among public libraries in Norrbotten, Sweden. Through practice-oriented document ethnography using semi-structured interviews with library staff, the study investigates how digital tools, and shared documents interact with everyday work and information practices within the collaboration. Drawing on socio-technological and practice-theoretical perspectives while highlighting the role of articulation work—often invisible yet essential tasks that sustain cooperation across organizational boundaries—the findings reveal that although formal structures such as shared routines and digital platforms (e.g. Microsoft Teams) may support coordination, much still relies on informal communication and mutual trust between participants. They navigate tensions between regional standardization and local autonomy. Furthermore, the study identifies a shift from consequence-based logic to appropriateness-based logic among participants, indicating the emergence of a community of interests. The study contributes to library and information science by offering a nuanced understanding of how regional collaboration is enacted in practice, especially in sparsely populated areas. It also suggests that digital infrastructure alone is insufficient to sustain collaboration; interpersonal relationships and contextual knowledge remain vital. Future research into collaboration between library organizations should further examine this interplay.