I use the old paper grocery bag too, I keep the top open until I get to the point where I'm holding on price or etc to sell and I'm not adding to the bag, I'll then roll up the top (so nothing foriegn gets in) and poke lots of small air holes in the bag. But before you enclose your roots in anything makes sure they are extremely dry, any amount of moisture left in the root can cause mold even if you have air holes. When you know your seng is extremely dry you can probably put it in any sealable container, but I would stay away from plastic. I keep my souvenir roots in mason jars. One of these days when I feel I need a health boost I'll probably use some of them for personal use. I'm not sure how long you can store and what potentcy loss is during storage though. Good luck out there.