The government has released guidance for people attending the Queen's lying in state, including listing the items people are banned from taking.
It is expected that there will be very long queues to attend, with the possibility of having to queue overnight, so mourners should be prepared to stand for many hours, and won't be able to sit down as the queue will be continuously moving.
Visitors will also have to go through airport-style security, and there are tight restrictions on what items will be allowed in.
Visitors will be allowed one small bag per person, which must be smaller than 40cm x 30cm x 20cm, with one zip for security to check quickly.
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