I don't think you want to completely seal it up.
why not ?
cooking.stackexchange.com/questions/109/why-does-a-brown-paper-bag-speed-ripening
Hrrrmmmmmmmm....
So paper bags allow moisture to pass through..
Is moisture really that huge a problem?
What If I do this.. I put some powdered Rice in the bag, or one of those desiccant packets.