The Case Star ® yoga mat bag is made of durable material. The round sides are specially designed for yoga mat. The shoulder belts are designed in backpack style to the convenience of carriage. A pocket is outside the bag to store your keys, towel and other necessities. Along with the yoga mat bag is a Case Star velvet cell phone bag as a gift. If you have any questions with any product by Case Star®, please do not hesitate to contact us and we will do our best to solve them. We take full ownership and responsibility for the quality of our products.