Like Bryan says, if you have a food saver or access to one, vac it, then when you're ready put it in some warm water, and let it get up to temp. you should avoid boiling, because I think that's bad with plastic.
Otherwise, put in a baking dish, pour some water to moisten the meat a little, cover tightly with foil (and put a lid on the dish if you have it) and re-heat at a low temp. The water might dissipate the smoke flavour a bit, but you want to re-heat in a moist environment or else the meat will get dry.
