A storage box, comprising: a container that is designed to contain materials, a lid that is designed to cover and seal a top opening of the container and a circular seal that is designed to enclose the lid; wherein the container includes the top opening and an inner peripheral shoulder on which the lid is designed to be positioned; wherein the lid includes a bottom plate, a top plate, a top plate anchor and a movable latch; wherein the bottom plate includes a horizontal arm that is projected from the bottom plate in a way that the height of a left section of the horizontal arm is bigger than the height of a right section of the horizontal arm, and an inclined middle section of the horizontal arm inclines and descends from left to right; wherein the top plate includes a central hole and one or more connectors that are designed to connect the top plate to the top plate anchor; wherein the top plate anchor is designed to anchor the top plate to be part of the lid and to be connected to the top plate by one or more connecting means that correspond with the connectors of the top plate; wherein the movable latch includes a horizontal protrusion that is projected from the movable latch in a way that a left section of the horizontal protrusion is flat and an inclined right section of the horizontal protrusion inclines and descends from left to right; wherein the height of the left section of the horizontal protrusion is equivalent to the height of the right section of the horizontal arm; wherein the movable latch is designed to be positioned between the top plate and the bottom plate, in a way that the horizontal protrusion is inserted under the horizontal arm of the bottom plate, and wherein said movable latch is accessible through the central hole in the top plate and can be moved from right to left and back to open and close the storage box; when the horizontal protrusion is under the left section of the horizontal arm, this is an open position, and in this open position the top plate is free to move upward, while when the horizontal protrusion is under the right section of the horizontal arm, this is a close position and in this close position the top plate is downwardly tight when the horizontal protrusion of the movable latch is tight between the bottom plate and the right section of the horizontal arm; when the lid is in the close position, the top plate is in downward position and it presses and tightens the circular seal to the side wall of the container and the storage box is closed and sealed in this close position, while when the lid is in the open position, the top plate is in upward position and it no longer tightens the circular seal to the side wall of the container and the storage box can be opened. wherein the container includes the top opening and an inner peripheral shoulder on which the lid is designed to be positioned; wherein the lid includes a bottom plate, a top plate, a top plate anchor and a movable latch; wherein the bottom plate includes a horizontal arm that is projected from the bottom plate in a way that the height of a left section of the horizontal arm is bigger than the height of a right section of the horizontal arm, and an inclined middle section of the horizontal arm inclines and descends from left to right; wherein the top plate includes a central hole and one or more connectors that are designed to connect the top plate to the top plate anchor; wherein the top plate anchor is designed to anchor the top plate to be part of the lid and to be connected to the top plate by one or more connecting means that correspond with the connectors of the top plate; wherein the movable latch includes a horizontal protrusion that is projected from the movable latch in a way that a left section of the horizontal protrusion is flat and an inclined right section of the horizontal protrusion inclines and descends from left to right; wherein the height of the left section of the horizontal protrusion is equivalent to the height of the right section of the horizontal arm; wherein the movable latch is designed to be positioned between the top plate and the bottom plate, in a way that the horizontal protrusion is inserted under the horizontal arm of the bottom plate, and wherein said movable latch is accessible through the central hole in the top plate and can be moved from right to left and back to open and close the storage box; when the horizontal protrusion is under the left section of the horizontal arm, this is an open position, and in this open position the top plate is free to move upward, while when the horizontal protrusion is under the right section of the horizontal arm, this is a close position and in this close position the top plate is downwardly tight when the horizontal protrusion of the movable latch is tight between the bottom plate and the right section of the horizontal arm; when the lid is in the close position, the top plate is in downward position and it presses and tightens the circular seal to the side wall of the container and the storage box is closed and sealed in this close position, while when the lid is in the open position, the top plate is in upward position and it no longer tightens the circular seal to the side wall of the container and the storage box can be opened.