A packaging method in extensible film of groups of products advancing in pairs of products, comprising the following steps: - ordering two rows of products, keeping them thus ordered and separates said products in groups of products; - feeding and passing said two rows of products thus ordered and separates in groups into a first ring winding unit of extensible film and winding said products in a first film in a first rotation direction forming a continuous packaging or bundle of groups of products; - advancing and feeding said products already wound in said first winding unit with a first film to a second ring winding unit of extensible film in a second film in a second rotation direction opposite to the first rotation direction, forming a continuous packaging or bundle of products spaced apart with two layers of film wound in opposite directions; - advancing and feeding said continuous packaging or bundle into a cutting unit, which moves in synchrony with said continuous packaging or bundle and which cuts said continuous packaging or bundle transversally into packages of products, characterized in that - upstream of said first ring winding unit said two rows continuous of products are separated and ordered into groups of products, spaced apart and separate from each other, after which said groups of separate spaced products are subjected to the subsequent steps of the method; - said winding step of said groups of products in said film in said two ring winding units (14,15) is selectively and alternately actuated by means of one of two ring winding machines provided for each of said two ring winding units (14,15) thus effecting a continuous winding of groups of products also in the exhaustion phase of said film in at least one of said two ring winding machines provided for each of said two ring winding units (14,15), each ring winding units (14, 15) comprises a frame, positioned astride with respect to the row of pairs of products of the group moving forward, which, on opposite sides, support two ring winding machines, the same but opposite. - ordering two rows of products, keeping them thus ordered and separates said products in groups of products; - feeding and passing said two rows of products thus ordered and separates in groups into a first ring winding unit of extensible film and winding said products in a first film in a first rotation direction forming a continuous packaging or bundle of groups of products; - advancing and feeding said products already wound in said first winding unit with a first film to a second ring winding unit of extensible film in a second film in a second rotation direction opposite to the first rotation direction, forming a continuous packaging or bundle of products spaced apart with two layers of film wound in opposite directions; - advancing and feeding said continuous packaging or bundle into a cutting unit, which moves in synchrony with said continuous packaging or bundle and which cuts said continuous packaging or bundle transversally into packages of products, characterized in that - upstream of said first ring winding unit said two rows continuous of products are separated and ordered into groups of products, spaced apart and separate from each other, after which said groups of separate spaced products are subjected to the subsequent steps of the method; - said winding step of said groups of products in said film in said two ring winding units (14,15) is selectively and alternately actuated by means of one of two ring winding machines provided for each of said two ring winding units (14,15) thus effecting a continuous winding of groups of products also in the exhaustion phase of said film in at least one of said two ring winding machines provided for each of said two ring winding units (14,15), each ring winding units (14, 15) comprises a frame, positioned astride with respect to the row of pairs of products of the group moving forward, which, on opposite sides, support two ring winding machines, the same but opposite.