Yes, you can take luggage on the ACTV Vaporetto (water bus) in Venice, but there are specific rules to prevent overcrowding. Each passenger is entitled to three pieces of luggage free of charge, provided the total dimensions (Length + Width + Height) of each piece do not exceed 150 cm. Only one of these three pieces can be between 120 cm and 150 cm. If you have "oversized" or excessive luggage, the crew may require you to purchase an additional ticket (approx. €9.50) or, on very crowded lines like Line 1 on the Grand Canal, deny you boarding for safety reasons. In 2026, it is a high-value "pro-tip" to keep your bags on the floor in the central deck area and never on the seats; the staff are notoriously strict about keeping aisles clear, and obstructing a thoroughfare can lead to a polite but firm "rebuke" in front of the other passengers.