Abstract: There is provided a protective and adjustable book cover for paperback books and magazines and the like, which has two complimentary sized cover sections having opposed and spaced apart plies connected along three edges thereof forming a pocket with the remaining edges open. The plies are spaced apart a distance sufficient to receive therebetween the cover of an associated book or magazine and are connected by a spine between the complimentary pocket shaped cover sections. The spine has a transverse dimension substantially coextensive with the open edges of the cover sections, and finally means resiliently connect the spine to at least one of the cover sections to provide an adjustable book cover for paperback books or magazines of various thicknesses and size.