The invention pertains to an agricultural harvester (1), which comprises a storage tank (6) that comprises: - a tank body (10), and - a tank cover assembly (20), which has a travel state and an operational state, wherein the tank cover (20) comprises a fabric wall element (24) which is moveably connected to the tank body (10), wherein in the operational state, the fabric wall element (24) provides an upward extension of at least apart of the circumferential wall (18), and wherein in the travel state, the fabric wall element (24) covers at least a part of the open top (16) of the tank body (10), and wherein the fabric wall element (24) comprises a rigid area (25), and wherein the cover actuator assembly (40) comprises at least one cover actuator (41) that is adapted to bring the tank cover assembly (20) from the travel state into the operational state and vice versa, and to engage said fabric wall element (24) at the rigid area (25).
