A convenient cooler bag that can adjust its size by rolling up the top. Cooler bags are useful in many situations during the summer, such as for shopping or carrying lunches. This bag, however, allows you to adjust its size according to the amount of items you put inside, so you can use it in various situations with just one bag. By rolling up the top of the bag and fastening the buckle, it can be used as a pouch-sized sub-bag inside your main bag. By attaching the included shoulder strap, it transforms into a larger bag that can be used as your main bag. It has a large capacity that can hold up to six 500mL PET bottles. Will be shipped folded.