My first option would be to go back and get my two buddies for help. As far as what to pack I would have to say of course a nice knife. Probably a skinner with a guthook. A bone saw and a pack ax to aid in quartering. A bunch of game bags and some rope along with my frame pack. With or without my buddies I would skin and quarter the elk. I would then bag it and start humping the quarters back to camp. I would bag the remaining quarters and cover them with brush until I returned. Once back at camp I like to hang the quarters from tree limbs to try and prevent other animals from taking them until a pack horse arrives (Usually at drop camps). I would also take my gps as well as planty of water (I get thirsty pretty quick ).