The DRY CUBE series is designed with a cube shape instead of traditional cylindrical shape for added storage. The top of the bag fold 2-3 degrees to close the bag for maximum water resistance. Therefore, it can be used for a variety of purposes, such as a sports bag at the gym, leisure around the water, emergency bag for emergencies. The 2.6 gal (10 L) is the perfect size for everyday use, so it can be used as a sports bag at the gym for easy changes of clothes, shoes, etc. 20L and 10L come with 2 shoulder straps so you can not only use it as a shoulder bag but also carry it on both shoulders like a backpack.