Expandable trolley suitcase comprising a bottom container (100) having a top opening, and a top container (200) having a bottom opening, the top container (200) and the bottom container (100) being slidably coupled to each other in correspondence of the bottom opening of the first one and of the top opening of the second one, at least one locking device (300, 310, 315, 350) interacting with the bottom container (100) and with the top container (200) and configured to assume a release configuration, at which it allows a reciprocal sliding of the bottom container (100) and top container (200), and a lock configuration, at which it prevents the reciprocal sliding of the bottom container (100) and top container (200), thereby the expandable trolley suitcase is configured to assume at least two geometric configurations, at which said at least one locking device (300, 310, 315, 350) assumes the lock configuration, depending on a position assumed by one between the bottom container (100) and the top container (200) with respect to the other, each one of said at least two geometric configurations having a respective storage volume delimited by the bottom container (100) and top container (200), said at least two geometric configurations including a minimum geometric configuration having a minimum storage volume and a maximum geometric configuration having a maximum storage volume.
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