when buying by the ounce at local shops they give me the tobacco in essentially zip lock bags. i'm still in the sampling stage of my piping career so i tend to just buy 2-4oz at a time of various blends. i noticed the tobacco aroma easily seeps through the bags so i'm assume moisture is as well. i know that mason jars are the preferred method for cellaring but what about storing bulk that is to be used regularly? would something like the screw on tupperware stuff work well? plastic would be preferred since i travel with my blends. thanks for the input!