The present disclosure relates to a shelf storage system 1 comprising hang standards 3 with slots 5 arranged in rows therein, brackets 7 comprising connector means 9 for connecting with hang standard slots 5 such that bracket becomes suspended thereby in a cantilevered manner, and shelves 11 adapted to rest on the brackets 7. The shelf 11 comprises on its bottom side at least first and second bracket connecting means, which are adapted to connect with brackets and are mutually spaced apart with a predetermined bracket distance d. The hang standard comprises a plurality screw holes for connecting the hang standard oriented vertically to a wall or the like, and the distance between at least two such screw holes corresponds to said bracket distance. This allows using a hang standard to mark locations for other hang standards, which simplifies assembling of the shelf system.