Why do you need a tsuba for the bokken? Although bokken are training swords made of wood or polypropylene, they are used in the

 Why do you need a bokken bag? As the bokken is a training weapon, it often has to be taken from home to training and brought back again.

Why do I need a saya for my bokken? Just like a real samurai sword, it makes sense to use a bokken saya with your bokken. Reasons