A unitarily molded environmentally protective backshell is provided with a unitary ratcheted tie strap for strain relief connection of a cable to the backshell. The backshell comprises a base for receiving an electrical connector therein and a cover hingedly connected to the base for environmentally protecting the electrical connector therein. Resilient latches lockingly retain the cover to the base. The interengagement of the cover with the base prevents outward bowing of the base side walls. The ratcheted tie strap lockingly engages a deflectable ratchet trigger which also is unitary to the base. The trigger is angularly aligned to walls of a tie strap receiving aperture and is dimensioned to exert a biasing force against the tie strap thereby preventing loosening of the strain relief connection.