A parcel comprising: - a case defining a cavity, the cavity being delimited by inner faces; - means for obturating the cavity comprising a lid, the obturation means being movably mounted on the case, between an open position allowing access to the cavity and a closed position obturating access to the cavity, the lid extending between a front edge and a rear edge, the lid being mounted by its rear edge on an upper edge of a rear panel of the parcel, - retaining means comprising a tray intended to press an object against one of the inner faces of the case, called support face, and a mechanism for coupling the tray to the lid and to the case; wherein the coupling mechanism comprises means for driving in mobility the tray when opening or closing the obturation means, the driving means being designed to drive the tray towards the lid and to allow access to the cavity during a passage of the obturation means from their closed position to their open position, the driving means comprise at least one deployable member movably mounted on the lid in the immediate vicinity of its front edge, characterized in that the coupling mechanism comprises means for elastically returning the tray in a position pressed against the support face; the driving means and the elastic return means being designed to drive together the tray into its position pressed against the support face during a passage of the obturation means from their open position to their closed position, the elastic return means comprise at least one elastic link extending from one end coupled to the tray to another end coupled to an attachment point in the parcel, the coupling mechanism comprises means for compressing the elastic link between its two ends, the compression means being active in the closed position of the obturation means and inactive outside this closed position, the lid, the rear panel, the tray, the elastic return means, and the deployable member(s) forming a deformable parallelogram. - a case defining a cavity, the cavity being delimited by inner faces; - means for obturating the cavity comprising a lid, the obturation means being movably mounted on the case, between an open position allowing access to the cavity and a closed position obturating access to the cavity, - retaining means comprising a tray intended to press an object against one of the inner faces of the case, called support face, and a mechanism for coupling the tray to the lid and to the case; wherein the coupling mechanism comprises means for driving in mobility the tray when opening or closing the obturation means, the driving means being designed to drive the tray towards the lid and to allow access to the cavity during a passage of the obturation means from their closed position to their open position, the driving means comprise at least one deployable member movably mounted on the lid in the immediate vicinity of its front edge, characterized in that the coupling mechanism comprises means for elastically returning the tray in a position pressed against the support face; the driving means and the elastic return means being designed to drive together the tray into its position pressed against the support face during a passage of the obturation means from their open position to their closed position, the elastic return means comprise at least one elastic link extending from one end coupled to the tray to another end coupled to an attachment point in the parcel, the coupling mechanism comprises means for compressing the elastic link between its two ends, the compression means being active in the closed position of the obturation means and inactive outside this closed position, the lid, the rear panel, the tray, the elastic return means, and the deployable member(s) forming a deformable parallelogram.