A storage system comprising: a panel adapted to be mounted between a first support beam and a second support beam, a plurality of covers mounted to an upper surface of the first support beam and to an upper surface of the second support beam respectively, wherein each cover of said plurality of covers comprises: a plate having an upper surface; an abutment portion extending upwards from a first side of the plate; a guide projection formed on the upper surface of the plate and extending along the upper surface at an angle to the abutment portion, the guide projection thereby diagonally extending along the upper surface of the plate between a second side and a third side of the plate; and at least one positioning projection (412a, 412b) extending outwards from the second side of the plate along the line of the guide projection, the first side being different from the second side and the third side, the second side and the third side being opposite sides of the plate; wherein a first cover of said plurality of covers is mounted on the first support beam, wherein a second cover of said plurality of covers is mounted on the second support beam, wherein an adjacent cover of said plurality of covers is mounted on the first support beam, said adjacent cover being adjacent to the first cover, wherein the panel is adapted to slide onto the first cover along its guide projection until the top end of the panel abuts the positioning projection formed in the second cover; and wherein the panel is further adapted to abut the abutment portion formed in the adjacent cover when the panel is subsequently turned in a direction away from the guide projection. a panel adapted to be mounted between a first support beam and a second support beam, a plurality of covers mounted to an upper surface of the first support beam and to an upper surface of the second support beam respectively, wherein each cover of said plurality of covers comprises: a plate having an upper surface; an abutment portion extending upwards from a first side of the plate; a guide projection formed on the upper surface of the plate and extending along the upper surface at an angle to the abutment portion, the guide projection thereby diagonally extending along the upper surface of the plate between a second side and a third side of the plate; and at least one positioning projection (412a, 412b) extending outwards from the second side of the plate along the line of the guide projection, the first side being different from the second side and the third side, the second side and the third side being opposite sides of the plate; wherein a first cover of said plurality of covers is mounted on the first support beam, wherein a second cover of said plurality of covers is mounted on the second support beam, wherein an adjacent cover of said plurality of covers is mounted on the first support beam, said adjacent cover being adjacent to the first cover, wherein the panel is adapted to slide onto the first cover along its guide projection until the top end of the panel abuts the positioning projection formed in the second cover; and wherein the panel is further adapted to abut the abutment portion formed in the adjacent cover when the panel is subsequently turned in a direction away from the guide projection. a plate having an upper surface; an abutment portion extending upwards from a first side of the plate; a guide projection formed on the upper surface of the plate and extending along the upper surface at an angle to the abutment portion, the guide projection thereby diagonally extending along the upper surface of the plate between a second side and a third side of the plate; and at least one positioning projection (412a, 412b) extending outwards from the second side of the plate along the line of the guide projection, the first side being different from the second side and the third side, the second side and the third side being opposite sides of the plate; wherein a first cover of said plurality of covers is mounted on the first support beam, wherein a second cover of said plurality of covers is mounted on the second support beam, wherein an adjacent cover of said plurality of covers is mounted on the first support beam, said adjacent cover being adjacent to the first cover, wherein the panel is adapted to slide onto the first cover along its guide projection until the top end of the panel abuts the positioning projection formed in the second cover; and wherein the panel is further adapted to abut the abutment portion formed in the adjacent cover when the panel is subsequently turned in a direction away from the guide projection.