No, you cannot take large backpacks or bulky bags into the archaeological site of Pompeii in 2026. For high-fidelity security and to prevent accidental damage to the ancient frescoes and walls, the park enforces a strict limit: bags must not exceed 30 x 30 x 15 cm (approx. 12 x 12 x 6 inches). This is smaller than a standard school backpack. If you arrive with a larger "High-Fidelity" bag, you must leave it at the complimentary luggage storage lockers located at the main entrances (Porta Marina, Piazza Esedra, or Piazza Anfiteatro). In 2026, it is a high-fidelity best practice to carry only a small "High-Fidelity" cross-body bag or a tiny daypack containing essentials like water and sunscreen. Because the site is massive and involve miles of walking on uneven Roman stones, carrying a heavy "High-Fidelity" pack is not recommended anyway; staying light is the high-fidelity key to exploring the ruins comfortably over several hours.