Cycling pack of specification that rolls the opening and closing part and fastens the belt. We used CORDURA® twill with twill weave CORDURA® material resistant to tearing and abrasion on the body. I applied water repellent finish, I used a water stop fastener for the fastener. I applied a liner lining to the lining and equipped a back pocket that can hold the PC. On the inside is a utility pocket that can store peripheral equipment such as mobile, adapter, and earphones.