You can usually enter musée picasso Paris with a normal small backpack or day bag, but a sightseeing backpack and travel luggage are not the same thing. Large museums use security checks and may refuse oversized items, so leave suitcases at your hotel or a proper luggage-storage service before visiting.

Locker and cloakroom rules vary by museum and can change with security conditions. Check the museum’s current visitor-information page before arriving with anything larger than a small day bag.

What I would bring

Small day bagUsually the easiest option after security screening.
Bulky backpackMay need to be stored or carried according to museum rules.
Cabin suitcaseDo not assume the museum will accept it.
Large suitcaseUse external luggage storage instead.

Do not build the day around a museum locker

Museum lockers are meant for visitors’ smaller belongings, not as a replacement for hotel luggage storage. If you are between checkout and a train, solve the luggage problem first, then visit the museum without dragging a case to security.

Before you leave

Empty the locker the same day and keep valuables with you. Rules can tighten temporarily, so a quick check of the official visitor page is worth doing if your bag is close to the stated size limit.