plastic bags leak air. glass jars with a rubber seal (mason jars) is best and keep it stored in the fridge (freezers will dry it out too and burst any cells with moisture left inside...not good). as long as your flowers have been properly dried and cured they'll keep for many months if kept in a cool and dark place...longer if kept refridgerated. i'm still smoking some hawaiian from '03 that's been kept in a jar in the fridge, and it still works very well and hasn't lost its flavor...

and only add fruits/veggies if your bud gets dried out. both can cause mold if not carfeully watched and generally is not needed unless your bud gets too crispy to roll. if it is needed, only leave it in long enough to refresh the flowers...then remove it.