Abstract: Break-out devices are provided for longitudinally extending elements. The break-out devices include a base member and a pair of ribs extending from the base member that define a longitudinally extending channel configured to receive the longitudinally extending elements therebetween. The inner sides of each of the pair of the ribs may include one or more longitudinally extending slots defining pairs of slots. A removable partition is inserted into the channel to provide a through-hole dimensioned to receive one or more of the longitudinally extending elements. The removable partition may be inserted in one of the pairs of slots. The partition may include a locking mechanism that retains the partition in the channel. Methods for organizing optical fiber elements using such break-out devices are also provided.