A resealable container system for storing paint, the system comprising: a container body having a closed base and a metal side wall extending, in use, upwardly from the base to define with the base an interior volume for containing paint, the metal side wall having an upper edge portion outwardly curled over to form a container rim which defines a mouth of the container body; and a removable lid adapted to be pressed onto the container body to a closed position in which the lid seals said mouth, the lid comprising an inner portion and a metal outer portion surrounding the inner portion, the metal outer portion comprising a sealing portion adapted to engage with at least a portion of an upper surface of the container rim, when the lid is in the closed position to form a seal between the lid and container body, the seal extending around the container rim, an outer wall portion connected to the sealing portion and adapted to extend, when the lid is in the closed position, down past an outer edge of the container rim, and a lid edge portion, extending from a lower end of the outer wall portion, wherein the sealing portion comprises a sealing surface adapted to form said seal with the upper surface of the container rim such that said seal extends over at least an upper outer quadrant of the container rim surface, said metal outer portion of the lid is formed from metal sheet and said sealing surface is a surface of said metal sheet, and said sealing surface is adapted to conform with said upper surface of the container rim, the resealable container system being characterised in that the lid edge portion is inwardly curled over to form a lid rim, the lid rim being arranged to engage and grip a portion of a lower surface of the container rim when the lid is in the closed position to hold the lid in place, and in that the system further comprises an opening tool for separating the lid from the container body, the tool comprising a lever portion and a hook portion attached to the lever portion, the lever and hook portions being arranged such that the tool can be arranged in at least one opening position, with respect to the container body and closed lid, in which the hook portion hooks under and engages a portion of the lid rim and the lever portion pivots against at least one pivot point on an external surface of the lid outer portion, such that when an upper end of the lever portion is displaced radially inwards to rotate the lever portion about the pivot point or points, the hook portion is displaced radially outwards, thereby displacing the engaged portion of the lid rim radially outwards to release its grip on the container rim and enable separation of the lid from the container. a container body having a closed base and a metal side wall extending, in use, upwardly from the base to define with the base an interior volume for containing paint, the metal side wall having an upper edge portion outwardly curled over to form a container rim which defines a mouth of the container body; and a removable lid adapted to be pressed onto the container body to a closed position in which the lid seals said mouth, the lid comprising an inner portion and a metal outer portion surrounding the inner portion, the metal outer portion comprising a sealing portion adapted to engage with at least a portion of an upper surface of the container rim, when the lid is in the closed position to form a seal between the lid and container body, the seal extending around the container rim, an outer wall portion connected to the sealing portion and adapted to extend, when the lid is in the closed position, down past an outer edge of the container rim, and a lid edge portion, extending from a lower end of the outer wall portion, wherein the sealing portion comprises a sealing surface adapted to form said seal with the upper surface of the container rim such that said seal extends over at least an upper outer quadrant of the container rim surface, said metal outer portion of the lid is formed from metal sheet and said sealing surface is a surface of said metal sheet, and said sealing surface is adapted to conform with said upper surface of the container rim, the resealable container system being characterised in that the lid edge portion is inwardly curled over to form a lid rim, the lid rim being arranged to engage and grip a portion of a lower surface of the container rim when the lid is in the closed position to hold the lid in place, and in that the system further comprises an opening tool for separating the lid from the container body, the tool comprising a lever portion and a hook portion attached to the lever portion, the lever and hook portions being arranged such that the tool can be arranged in at least one opening position, with respect to the container body and closed lid, in which the hook portion hooks under and engages a portion of the lid rim and the lever portion pivots against at least one pivot point on an external surface of the lid outer portion, such that when an upper end of the lever portion is displaced radially inwards to rotate the lever portion about the pivot point or points, the hook portion is displaced radially outwards, thereby displacing the engaged portion of the lid rim radially outwards to release its grip on the container rim and enable separation of the lid from the container.