Reader’s Digest suggests that the paper towel absorbs moisture, which helps your produce last longer:
Make your produce last long enough so you can eat it. Line your vegetable bins with paper towels. They absorb the moisture that causes your fruits and vegetables to rot. Makes cleaning up the bin easier too.
If you can’t seem to eat all the vegetables you buy at the supermarket, well, maybe you should buy fewer vegetables! But if that’s simply not an option, or you’re really just looking for a way to extend their freshness, try a paper towel.
9 Things You Can Do With Paper Towels [Reader’s Digest]