FOLDABLE / DEPLOYABLE DEVICE FOR PASSENGER SEATS OF A TRANSPORT VEHICLE The invention relates to a foldable / deployable device for passenger seats of a transport vehicle, characterized in that it comprises: a first portion (2) configured to be able to surround at least one headrest of at least one first seat, a second portion (6) comprising at least two hooks (15, 16, 17, 18) configured to be able to be fixed to the backrest of a second seat, a third portion (4) extending from said first portion (2), configured to be able to extend at least partially between said headrest and the seat of said first seat, at least a fourth portion (5) and a fifth portion (7) configured to be able to form, in a deployed state of said device, at least a first surface (25) and a second surface (27) for receiving luggage,said fourth portion (5) and fifth portion (7) linking said second portion (6) and said third portion (4). Figure for the abbreviation: figure 1,