wherein the relatively movable rod cages are formed of rods 44 and 45 of circular cross section at rather wide circumferential spacings in this case filler body 40 is formed as a hollow body 46 filled with a resilient filler material 47 or with a gaseous medium permitting it to adapt itself to the movements of rods 44 and 45 relative to each other and to project over a considerable distance into the openings without colliding with the yarn windings on the storage surface the filler body indicated in fig3 may also consist of individual foamed plastics flakes or shreds having a greater size than the openings these foamed plastics flakes may then be compressively stuffed into the storage body so as to completely fill it thus preventing the intrusion thereinto of dust and other contaminants in the case of permanently assembled storage bodies of cage like construction it is also possible to introduce a resilient balloon envelope thereinto and to subsequently inflate it so as to completely fill the hollow space of the storage body it is further contemplated to introduce a resilient envelope into the storage body and to subsequently inject a foam material thereinto so that the envelope adopts the shape of the storage body hollow space to completely fill it in the case of.