Magnetic tape cartridges package

A package having a longitudinal direction defining an X direction, comprising:

• a plurality of accommodation regions where a plurality of holders are accommodated in such a manner that the plurality of holders are able to be put in and out in a Y direction, transverse to the X direction;
• and
• a partition structure configured to divide the plurality of accommodation regions,
• wherein each holder is configured to hold a plurality of magnetic tape cartridges in such a manner that the plurality of magnetic tape cartridges are able to be put in and out of the holder,
• each holder is configured to be accommodated in a respective one of the accommodation regions,
• in a state in which the holder is accommodated in the accommodation region, a length of the partition structure in the Y direction is longer than a length of the holder in the Y direction,
• the partition structure is separable from the package,
• a magnetic tape is accommodated in each of the magnetic tape cartridges,
• the holder is accommodated in the accommodation region in a posture in which the magnetic tape cartridges are set in a portrait orientation,
• the portrait orientation is an orientation in which both ends of the magnetic tape in a width direction are positioned along a direction crossing a direction in which the holder is put in and out of the accommodation region,
• a single individual is formed by each of the holders and the plurality of magnetic tape cartridges held by each of the holders,
• each of the holders has a housing structure configured to accommodate the plurality of magnetic tape cartridges inside,
• each of the holders has an opening portion which is an exposure region where the plurality of magnetic tape cartridges are exposed,
• the opening portion is formed by opening one surface in the housing structure with respect to an outside,
• the magnetic tape cartridge is put in and out of the holder through the opening portion,
• each of the plurality of accommodation regions has a partition wall surrounding all sides of the accommodated holder, and
• the partition wall of the accommodation region that directly faces an inner wall of the package has a projecting portion that presses against the inner wall in the X direction.