The large U-shaped opening helps the bag stay standing, even when empty, and the lined side pocket allows you to separate your shoes from your clothes. The bag also features hidden shoulder straps in the top lid pocket and similar to our trolley's, the main zipper is lockable for safe traveling. Large U-shaped opening into main compartment. Separate shoe pocket for storage of shoes or clothes. Hidden padded shoulder straps in top lid pocket. Main zipper is lockable.