Abstract: The invention is to provide a packing method for recording tape cartridges and a package of recording tape cartridges, which can prevent tape performance from being affected by humidity change when the recording tape cartridge is carried and can compact a storage case can be provided. In a packing method for recording tape cartridges and a package of recording tape cartridges of the invention, a plurality of recording tape cartridges are stored in a storage case, each of the recording tape cartridges including a case having an upper case and a lower case and accommodating therein a reel on which a recording tape is wound, at least one recording tape cartridge, in which at least one of the upper case and the lower case is formed of a resin material having a humidity controlling effect, is stored in the storage case.

Abstract: A manufacturing method of a reel including a substantially cylindrical hub, around an outer peripheral surface of which a recording tape is wound, and flanges provided at end portions of the hub, includes entering a pelletized resin material and a fibrous conductive material whose length is longer than a pellet length of the resin material into a molding machine to mold the hub and the flanges, thereby providing conductivity to the hub and the flanges.