What's on my mind is when I sculpt with clay. My first ceramics instructor recommended that we lay down a slab of the same kind of paper which paper bags are made out of, to keep the clay from getting embedded into the work surface. (This is important when working with different colored clays, as you don't want say a light clay to pick up dark clay from your table.) I quickly abandoned this approach and started using the Glad Press & Seal plastic wrap. Yes, it's more expensive. But it had two things going for it. First, it does actually stick to the work surface, then I can just peel it off when I'm done. It also sticks to itself, so I can wrap it around a sculpture which is in-progress to keep the clay moist when I'm not working on it, without worrying if the sculpture fits nicely into a bag. Second, it doesn't wick moisture from the clay - I was finding the bottoms of the sculptures were drying out too quickly when the paper was used, before I had a chance to finish. When clay dries unevenly, you also risk problems when you go to fire the piece in the kiln. But yes, it is more expensive than paper bag paper.moisture retention for cheap...
Now you're not sculpting, so you don't have color transfer to worry about, and you don't care about uneven drying out, per se. But you do care about drying out too quickly overall, and I'm thinking you might have a similar issue to the one I had with the clay. And I'm also thinking the paper might be more prone to becoming moldy if it's kept damp. Still, airflow is a question - more air = faster drying, and also less prone to mold. Hmm. Gotta ponder that a bit more....