Yes, you can absolutely bring luggage on the ferry from Split to Dubrovnik, which is a popular 4.5 to 5-hour journey through the Adriatic. Most major operators like Jadrolinija and Kapetan Luka allow one large piece of checked luggage (typically up to 20kg or 23kg) included in the ticket price. Unlike a plane, you do not usually "check" the bag at a counter; instead, you carry it onto the vessel and place it in large communal luggage racks or designated storage areas near the entrance or in the center of the cabin. On high-speed catamarans, space can become tight during the peak summer season of 2026, so it is wise to board early to secure a spot for your bags. While there is rarely a strict weighing process, you are responsible for maneuvering your own luggage up the gangway, so ensure you can manage your bags comfortably. Small personal items and backpacks can be kept with you at your seat.