Abstract: This invention relates to a closing device (10) for a bag (1), particularly an insulated bag (1), comprising a first section (100) fitted with a handle (103) and fixed along part of the periphery on the side on which the bag (1) is open, and a second section (110) fixed by a portion of its said external surface along another part of this periphery and through which a hole is formed along a centre line (A) in which, the handle (103) can be inserted in a plane containing the centre line of the hole and the said insertion plane. This closing device is characterised in that it comprises means of fixing the handle (103) in the position inserted in the hole in the second section (110).