Abstract: A laminated body includes an innermost layer including a sealant formed of a polyethylene-based resin and a reinforcing layer formed of a polyethylene-based resin. The reinforcing layer is formed of an unstretched polyethylene-based resin. A packaging bag includes a bottom member folded in half along a fold line. At least the bottom member of the packaging bag is formed of the laminated body.

Abstract: A cover of a nut according to the present invention is constituted of a resilient body, having a cavity shaped so as to be prevented from turning by an operating means formed on the nut for convenience of turning the nut adapted to be engaged with the bolt and being equipped with a tubiform basal portion receiving the periphery of the nut engaged with the bolt to be fitted within said cavity and a hollow swelled portion extending integrally from one of the ends of said basal portion and closed at an end located far from the basal portion. Said resilient body is provided with a disengagement-proof means preventing the cover applied over the nut from slipping out of the nut after displacing in the direction of the axis of the nut.