A container includes a tray having an outwardly extending tray flange and a rib projecting upwardly from at least a portion of the tray flange to at least partially define an open top and a cover terminating in an outwardly extending cover flange with a skirt projecting upwardly from the cover flange. When the cover is mounted to the tray to close an open top of the tray, a portion of the skirt lies on top of the rib, and an amount of the skirt that is pinchable is insufficient to apply the force required to overcome a peripheral seal between the cover and the tray to separate the cover from the tray.