This Bambu Lab Spool Storage Container can be stored vertical, on rails, or horizonal.  Two versions have been included, with and without an interior base.  Pictured is the container without a base/bottom, it is very strong for the limited amount of filament utilized.  If you would like to have the ability to remove the container from the spool with tools, I would recommend printing with a base. 

Love it or hate it, I printed this container with fuzzy skin, and it prevents the vertical sections that show up from printing circular items (looks really good).

Hope this helps someone, enjoy!