Shinjuku Station, the busiest transit hub in the world, is equipped with thousands of coin lockers of various sizes, but finding an empty one can be a challenge due to the massive volume of travelers. Lockers are scattered throughout the station, both inside and outside the ticket gates, particularly near the West, East, and South exits. In 2026, most lockers have been modernized to accept "IC Cards" like Suica or Pasmo, which act as your digital key, though traditional coin-operated ones still exist. There are three standard sizes: "Small" (for backpacks/handbags), "Medium" (for carry-on suitcases), and "Large" (for full-sized checked luggage). If the station lockers are full, a highly reliable alternative is the Sagawa Express or Yamato Transport baggage counters located within the station or in the nearby NEWoMan building, which offer "hands-free travel" storage for a flat daily fee. Additionally, many travelers now use the "Ecbo Cloak" app, which allows you to reserve storage space in nearby shops and cafes, ensuring you aren't wandering the labyrinth of Shinjuku with a heavy suitcase in tow.