I freeze my sauce all the time in freezer quart zip lock bags with never any freezer burn. There's a trick to it.
Turn the top of the bag over itself to form a collar.This keeps the bag open, and protects the zip lock part from getting the sauce on it. Hold the bag in in the palm of your hand, and using a ladle fill the bag 3/4 full. Turn the collar back up and carefully expel the air before sealing the bag. Freeze them flat on a cookie sheet and then they stack nicely in the freezer when making a large batch. For gifts, the added bonus, is no worries about getting your container back.
Maybe everyone does this but just thought I'd pass it on.