We’ve learned that not all freezers are the same. Some are wetter/warmer than others. Ice caps can develop in the freezer and moisture can get into the packaging. The best tip/trick we’ve learned for this situation is to double bag the bread; this appears to eliminate the issue. On donation day: take the bread out of the freezer, remove the outermost wrapper, and keep that for the next round of packaging.
Another suggestion is to place the loaves in an insulated shopping bag (like those used to transport ice cream home from the grocery store). In this case, you only need one plastic bag, just place the packaged loaves directly in the insulated bag and then pop it in freezer. This is also a beneficial practice for the cookies, as it helps them stay as fresh as possible.
Let us know in the comments if this helps, or if you have another tip to share.