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A new slack fiber organizer structure composed of individual box-shaped plastic sheets is presented. It is capable of accommodating 800 fiber splices with the same size as the existing metallic cable joints. The conditions to accommodate reinforced mass-splices and slack fibers into the organizer are clarified by considering optical loss increase and reliability evaluation for bent fiber ribbons, and also a computer-aided dimension simulation. The new organizer with 800 fiber splices experimentally exhibits good transmission characteristics with an average slack fiber accommodation loss of 0.04 dB and a good workability of 1.2 min/ribbon.