Abstract: The present invention relates to a composite container suitable for the lasting preservation, under absolutely sterile conditions, of sterile, solid products, particularly pharmaceutical products.Such a container comprises an inner bag, or tubular element, made of low-density polyethylene and directly containing the product to be preserved and an outer bag consisting of three layers of different materials, of which polyethylene, the high-density type being preferred, or polyvinylchloride forms the innermost layer, aluminium the intermediate layer and a polyester resin the outermost one: the ends of the bags are hermetically sealed.