This convenient cooler bag allows you to adjust its size by rolling up the top. Cooler bags are useful in the summer for things like groceries and lunches, and this bag can be adjusted to fit the amount of items you put inside, making it versatile for various situations. By rolling up the top of the bag and securing the buckle, it becomes a pouch-sized bag that can be used as a sub-bag inside your main bag. Attaching the included shoulder strap transforms it into a larger bag that can be used as your main bag. It has a large capacity, able to hold up to six 500mL PET bottles. It will be folded for shipping.