This is a shoulder strap from Ocean & Earth. It's an item that makes carrying heavy SUP boards easier by using this belt. The included storage bag is a waist pouch, which can be worn around the waist after use, or used as a waist pouch to carry your smartphone or drinks, making it a convenient item. I haven't had a chance to use it since I bought it, so it's completely unused. It's a very useful item for those who struggle to carry their SUP.