Abstract: A laboratory fluid receptacle cooler arrangement (10) for sustaining a desired temperature range, comprising a housing (16), a lid (32) covering an open top side of said housing (16), and an aperture closing element (11), wherein: the aperture closing element (11) at least partly covers said lid (32) and has a number of apertures (14). The lid also (32) comprises a number of apertures (44). The aperture closing element (11) is movable relative to the lid between open and closed positions, the aperture closing element and the lid having matching aperture configuration, thereby providing throughholes when the aperture closing element and the lid are in open configuration. Also, a cooler closure arrangement (30) with an aperture closing element (11) on top of a lid (32) where the aperture closing element (11) and the lid (32) are parallel and substantially plane rectangles in slideable engagement with each other.