How to prevent frozen food from freeze-drying?
The way to prevent freezer burn, or at least delay it as long as possible, is to remove air.  Even fairly low-end vacuum sealers will help you here.  However, if you don't want to get one, or can't, the next best thing is to use freezer zip bags and employ Archimedes principle.  It's commonly used in sous vide cooking, but can certainly help to remove air for freezing.  Another option is to seal a zip bag most of the way, with a straw inserted.  Suck the air out, then, in one swift motion, remove the straw and seal the bag.  By the way, both of these suggestions would work for more delicate items, like bread.