I really don't know the answer to this, but would think that you would want to plant them before the hair roots dried out. If you're determined that you have to wait I'd recomend storing them in some damp(not wet) peet moss in a cool environment until you can get them in the ground.
Check with your state laws. Here in ohio wild harvested ginseng must be sold by March 31st of the following spring. I think this is pretty typical of most states, but really don't know for sure. Kind of screwy law, but it's done to track how much ginseng is being dug on an annual basis.
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.
For roots that you want to replant, dont wash off the dirt, keep them in a ziplock bag in the fridge. Line the bottom of the bag with paper towels to collect extra moisture to prevent molding. Occasionally re-moisten roots if needed. They will keep this way for a good while. Several months is properly cared for.