A method of applying and interlocking a re-sealable closure onto a beverage bottle, said beverage bottle comprising a body, a cylindrical neck connected to said body and a mouth connected to said neck opposite said body and defining an opening, said mouth comprising an outwardly oriented bulge at a first axial distance from said opening, said bulge defining a first outer periphery at said first axial distance, said closure comprising: a cap comprising a disc defining a second outer periphery, said disc being adapted to cover said opening of said mouth, said second outer periphery being divided into a first part periphery and a second part periphery, a first skirt part extending from said first part periphery of said disc in an axial direction in relation to said disc, said first skirt part defining a third part periphery opposite said first part periphery at a second axial distance from said first part periphery, said second axial distance being larger than said first axial distance and said third part periphery being larger than said first outer periphery of said bulge, a second skirt part and a third skirt part extending from said first skirt part on opposite sides of said first skirt part and between said first part periphery and said third part periphery, and the method comprising the step of: deforming said-first skirt part in an inwardly direction such that said third part periphery is caused to be smaller than said first outer periphery of said bulge, thereby interlocking said first skirt part and said first cam surface with said outwardly oriented bulge of said mouth, characterized in said closure further comprising: a cam axle establishing a journaling axis between said second skirt part and said third skirt part at a radial distance from said second part periphery, said cam axle defining a first cam surface at a first radius from said journaling axis and a second cam surface at a second radius from said journaling axis, said first radius being larger than said second radius, said cam axle being rotatable between a first position in which said first cam surface is defining a fourth part periphery being smaller than said first outer periphery for causing said first cam surface to interlock with said bulge, and a second position in which said first cam surface is facing away from said bulge and said second cam surface is defining a fifth part periphery being larger than said first outer periphery of said bulge thereby allowing said closure to be removed from said bottle, said method further comprising the initial steps prior to said step of deforming said first skirt part of: providing said beverage bottle and said re-sealable closure, said cam axle being in said first position, applying said closure onto said beverage bottle such that said opening is covered by said disc and said bulge is partially covered by said first skirt part. a cap comprising a disc defining a second outer periphery, said disc being adapted to cover said opening of said mouth, said second outer periphery being divided into a first part periphery and a second part periphery, a first skirt part extending from said first part periphery of said disc in an axial direction in relation to said disc, said first skirt part defining a third part periphery opposite said first part periphery at a second axial distance from said first part periphery, said second axial distance being larger than said first axial distance and said third part periphery being larger than said first outer periphery of said bulge, a second skirt part and a third skirt part extending from said first skirt part on opposite sides of said first skirt part and between said first part periphery and said third part periphery, and the method comprising the step of: deforming said-first skirt part in an inwardly direction such that said third part periphery is caused to be smaller than said first outer periphery of said bulge, thereby interlocking said first skirt part and said first cam surface with said outwardly oriented bulge of said mouth, characterized in said closure further comprising: deforming said-first skirt part in an inwardly direction such that said third part periphery is caused to be smaller than said first outer periphery of said bulge, thereby interlocking said first skirt part and said first cam surface with said outwardly oriented bulge of said mouth, characterized in said closure further comprising: a cam axle establishing a journaling axis between said second skirt part and said third skirt part at a radial distance from said second part periphery, said cam axle defining a first cam surface at a first radius from said journaling axis and a second cam surface at a second radius from said journaling axis, said first radius being larger than said second radius, said cam axle being rotatable between a first position in which said first cam surface is defining a fourth part periphery being smaller than said first outer periphery for causing said first cam surface to interlock with said bulge, and a second position in which said first cam surface is facing away from said bulge and said second cam surface is defining a fifth part periphery being larger than said first outer periphery of said bulge thereby allowing said closure to be removed from said bottle, providing said beverage bottle and said re-sealable closure, said cam axle being in said first position, applying said closure onto said beverage bottle such that said opening is covered by said disc and said bulge is partially covered by said first skirt part.