a folded moisture and heat resistant container is manufactured of a material of laminate type in the form of a sheet or a web , said laminate comprising at least a base layer , an outer coating and an inner coating . the material is at least on one side thereof heat treated in an autoclave . in the material the case layer consists of a liquid absorbing material , the outer coating consists of a polymer selected from the group including polypropylene , oriented polypropylene , metalized high density polyethylene , linear low density polyethylene , unmodified polyester , metalized polyester and amorphous polyester , and the inner coating consists of a polymer selected from the group including polypropylene , high density polyethylene , linear low density polyethylene , unmodified amorphous polyester .