It could be anything besides the obvious “I have yoyos in my yoyo case to make it complete”. It could be… types of strings, bearing types, a certain special yoyo? Let me know what makes your yoyo case feel complete.
For me I always have to have some extra bearings, a string cutter, extra Big Yoyo String stickers, a bearing remover tool, and my case must have as many stickers stuck to the upside to be complete!
Your turn, What makes your yoyo case feel complete?