Yes, you can absolutely bring luggage on the Tokyo Monorail, as it is specifically designed to transport passengers between Haneda Airport and central Tokyo (Hamamatsucho Station). The trains are equipped with dedicated luggage racks near the doors, and the floor layout is more spacious than standard city commuter trains to accommodate travelers with large suitcases. There is no extra charge for bringing luggage, and you do not need to make a reservation for your bags. However, there are general "size limits" for all Japanese trains: you may bring up to two pieces of baggage where the total dimensions (height + width + depth) do not exceed 250 cm and the weight is under 30 kg. While the Monorail is very luggage-friendly, it can become extremely crowded during the morning and evening rush hours (roughly 7:30–9:00 AM and 5:30–7:00 PM). If you are traveling with very large or multiple heavy bags during these peak times, you might find it difficult to maneuver, and many locals recommend using a luggage forwarding service (Takkyubin) to send your bags directly to your hotel instead.