That paper towel will suck the moisture out of the leafy green, wilting it quickly, and the paper bag is too porous, and will compound the problem. I often use simple tupperware type containers, or zip locks, although the best method is to use the Green Storage bags that you see advertised here and there.
Also, don’t jam your leafies into anything, give them some space to breathe. And don’t wash leaves before storage.
To answer questions about organically grown shelf life (vs. conventional)….if a produce item stays “fresh” beyond its normal shelf life, it’s because it’s been sprayed with a chemical to make it so. There are fungicides that will keep fruit looking fresh, but the trade off isn’t worth it. Heck, that’s why our subscribers are choosing to purchase organic produce from us.