Apparatus for storing slack fiber optic cabling. A cabinet enclosure has an opening for allowing access to cabling and other components inside the enclosure, and a number of spool tracks are supported inside the enclosure. Each of a number of cable spool assemblies includes a spool dimensioned to guide a length of fiber optic cabling in a desired path over part of the spool circumference with at least a minimum cable bend radius, and a mechanism for (i) mounting the spool on a corresponding spool track for sliding movement to a desired position along the track, and (ii) fixing the spool at the desired position. Slack fiber optic cabling can be stored in the cabinet with an optimum lay when the cabling is guided by selected spools of the spool assemblies, and the spools are moved to and fixed at certain positions on the spool tracks.