Abstract: A pile up tray includes a base piece shaped as a cask, cast to be a bottom of the tray in which a rising double marginal flange is provided and to which at least one other piece is jointed. The other piece forms at least part of the side walls of the tray. The cask is placed inside of the piece or pieces that form the side walls of the tray, overhanding with respect to the lower edge of the pieces that form the side walls of the tray, so that during the piling of a number of trays up, the bottom part of each tray is placed into a mouth of the lower tray. The side walls of the tray can be provided with folding flanges which fold towards the inside of the tray and are fixed to the side walls by glue, to provide the tray with more resistance to compression.