Significantly increases the storage capacity of Ultimate V-IV!!

Optional backpack that can be joined with Ultimate V-Ⅳ. It can be jointed with Ultimate V-IV using the buckles on both shoulders and sides. The bag has a capacity of 12L, allowing you to approach the points while storing drinking water, food, gear such as rainwear and rock shoes. Recommended when entering points over long distances or when fishing to remote islands where the amount of baggage is limited. Comes with two shoulder straps, so it can be easily used alone.