My local co-op had a basement flood. Since the bag I bought a month later was "plasticized" and not paper, they apparently didn't realize it got wet through the bottom seam. I didn't see any mold till I was at the bottom of the bag, then it was too late. I store all my feed in big trash cans, in the original bags so I know it was wet before I bought it. TSC has quite a rep lately for selling moldy feed, it seems. Not sure if it's the way they store it or what, but they are obviously not the only ones.