Great question. I've been asking this of my ice cubes and was too lazy to look it up untill now.

Here is a 5 step way to prevent freezer burn in general.

1. Understand how freezer burn works.

2. Keep the freezer temperature as constant as possible.

3. Keep the temperature in your freezer below 0 degrees F (-18 degrees C). Freezer burn only happens when temperatures fluctuate above 0 degrees F. Use a freezer thermometer to make sure the freezer is cold enough.

4. Package food tightly.

5. Don't store food in freezer for too long.