Yes, you can take a backpack into Westminster Abbey in 2026, but it must be small and subject to a security check. Large hiking backpacks, suitcases, or any bag larger than "cabin size" (roughly 55cm x 40cm x 20cm) are strictly prohibited for safety and preservation reasons. Every visitor must pass through a security screening, which includes a bag check and a walk-through metal detector. It is also important to note that the Abbey does not have a cloakroom or storage facility for prohibited bags; if you arrive with a large pack, you will be turned away and directed to use private luggage storage services (like Stasher or Radical Storage) located near Victoria or Charing Cross stations. Small, standard-sized daypacks are generally allowed, provided they are worn on the front or carried by hand in crowded areas to avoid accidentally bumping into the ancient stone monuments or other visitors.