actually.. brown paper (like ones from the grocery store) bags are preferred over the plastic paper type bags.
for a reason! brown paper bags don't have any chemicals to bleed into your buds (such as bleach, with other bags contain)... which is why most people prefer to use the brown paper bags, over other types of bags. Last thing you want is chemicals from the bag bleeding into your beautiful buds.
hope that helped.
peace.
P.S. - Here's a little more information about using the bagging process.
After the marijuana buds are trimmed (and a little moist still) you would want to dry them some more in the paper bag step. The best choice would be the brown shopping bags found at a supermarkets, because they are not bleached (the stuff you don't want in your buds) This is another tricky step. Put the trimmed marijuana buds in the brown bag loosely and its best not to fill it more than 3-4 inches from the bottom. It is not necessary at this time to close the bag ( still need to prevent mildew and mold) When the buds are in the bag you would want to check every day to rotate the buds in the bag so they dry evenly. This can be achieved by shifting positions of the marijuana buds, turning them ever so often, or shaking the bag. As the buds dry they will naturally compact into the self-preserving state that is mostly desired . At this time that the buds can be more compacted together and the bag can be folded close. They should now be fully smokable, though perhaps still ! slightly moist in the middle. A big reminder that every climate differs and may take more or less time. There is nothing better than repeated, hands-on checking to prevent damage to the marijuana buds from mold and mildew.
That should pretty much tell you what you need to know. Your welcome.
peace..