Great thread thank you BB.. twa on your question. Those seal a meal machines are great for preventing or delaying freezer burn on foods. One of two things are needed to create freezer burn, air or moisture or both. Sealing food in those machines eliminates the air, moisture can still be their but it needs the air to burn and destroy the food product.
They also eliminate the air, which bacteria need to get too your food, in a non freezer setting. Now not good for anything that contains moisture to start with, but great for rice, beans and other dry products so moisture does not get too them.
Putting items in your freezer they may sit for a bit, so take a sharpie and date them for good rotation.