A new and improved sealed joint or system is disclosed for securing together the opposite ends of plastic strapping, which is encircled around the package or bale, in order to ensure that the opposite ends of the plastic strapping do not exhibit any slipping or relative movement with respect to each other whereby the predeterminedly formed size or shape of the package or bale is able to be preserved or maintained. In accordance with various different embodiments of the present invention, different arrangements of the sealed joint, with respect to the opposite ends of the plastic strapping, are structured whereby enhanced frictional contact is effectively developed between the sealed joint and the opposite ends of the plastic strapping, or between the opposite ends of the plastic strapping per se, so as to in fact reduce the amount of slipperiness effectively defined between the opposite ends of the plastic strapping. In accordance with a still further embodiment of the present invention, the opposite ends of the plastic strapping are effectively locked within a tubular sleeve member, by means of a chain-link type insert, such that the opposite ends of the plastic strapping are positionally fixed with respect to each other.