For offshore big game fishing you need to have a replacement spool with the perfect line system. Change the spool immediately when you feel a little worries about line problems or lines. This is the basics.
When using light lines, scratches and dents on the spool edge are absolutely a must have to be worn as they will scratch the line.
The mazume spool case protects your precious replacement spool with neoprene, and uses a tarpaulin on the top lid so you can write data from the outside as soon as you see the spool counter, and the line you are curled. The data you write with a permanent pen can be erased using an eraser (but it will not fade perfectly) and can be rewritten.