Ueno Station has extensive coin locker facilities located throughout the station complex, though they are technically part of the station rather than Atre Ueno itself. You'll find numerous lockers near the Central Exit, Park Exit, and other major exits, with sizes ranging from small (¥300-400) to large (¥600-700) per day. However, these lockers fill up quickly, especially during peak travel seasons and weekends. If lockers are full, luggage storage services are available at the nearby Ecute Ueno shopping area or at dedicated luggage storage facilities within walking distance of the station.