Water proof zipper that is strong against rain and water splash is used for the upper body fastener (not completely waterproof).
Square shape that is easy to handle, upper square shape that is easy to store and take out, side pocket that is easy to store small items, and a belt loop that can also be used to attach small items.
Large mesh pad on the back that is strong against stuffiness and easy on the back.
Two compartments structure of upper bag, lower bag which can hold reels (removable).
Cushioned lower bag that can store reels. With a separator that suppresses the collision of stored items.