A gusset style pouch comprising: - a flexible bag comprising a bottom, a front wall and a rear wall defining a flexible sidewall extending around a longitudinal axis, two junctions (6a, 6b) at opposite sides between the front wall and the rear wall, so that the bag defines a single opening opposite to the bottom; - a closure system comprising a first strip (8; 108; 208; 308; 408) sealed to one amongst the front wall and the rear wall and a second strip sealed to the other one amongst the front wall and the rear wall, the first strip and the second strip being interlockable strips for attachment at an interlocking area in a closed configuration of the closure system; - a hold open arrangement comprising: i) a first predetermined flexing line adjacent to one of the two junctions, ii) a second predetermined flexing line adjacent to the other of the two junctions, and iii) a main flexible part extending between a first end partly delimited by the first predetermined flexing line and a second end partly delimited by the second predetermined flexing line, locking means being rigidly coupled to at least one of the first end and the second end and configured to pivot from a first flat configuration obtained when the closure system is in the closed configuration to a second configuration, which is a bent, flexed, or engaged configuration; characterized in that the main flexible part and at least one locking element (41, 42, 141, 142) of said locking means are formed by the first strip which is made of a determined semi rigid plastic material, and in that the second strip, which is made of a semi rigid plastic material, preferably of the determined semi rigid plastic material, defines at least one contact surface (CS1, CS2) for retaining said locking element (41, 42, 141, 142) in the second configuration, whereby the first strip (8; 108; 208; 308; 408) and the second strip of the closure system define the hold open arrangement. - a flexible bag comprising a bottom, a front wall and a rear wall defining a flexible sidewall extending around a longitudinal axis, two junctions (6a, 6b) at opposite sides between the front wall and the rear wall, so that the bag defines a single opening opposite to the bottom; - a closure system comprising a first strip (8; 108; 208; 308; 408) sealed to one amongst the front wall and the rear wall and a second strip sealed to the other one amongst the front wall and the rear wall, the first strip and the second strip being interlockable strips for attachment at an interlocking area in a closed configuration of the closure system; - a hold open arrangement comprising: i) a first predetermined flexing line adjacent to one of the two junctions, ii) a second predetermined flexing line adjacent to the other of the two junctions, and iii) a main flexible part extending between a first end partly delimited by the first predetermined flexing line and a second end partly delimited by the second predetermined flexing line, locking means being rigidly coupled to at least one of the first end and the second end and configured to pivot from a first flat configuration obtained when the closure system is in the closed configuration to a second configuration, which is a bent, flexed, or engaged configuration; i) a first predetermined flexing line adjacent to one of the two junctions, ii) a second predetermined flexing line adjacent to the other of the two junctions, and iii) a main flexible part extending between a first end partly delimited by the first predetermined flexing line and a second end partly delimited by the second predetermined flexing line, locking means being rigidly coupled to at least one of the first end and the second end and configured to pivot from a first flat configuration obtained when the closure system is in the closed configuration to a second configuration, which is a bent, flexed, or engaged configuration;