1. Go heavy. Always use freezer-specific, moisture-proof plastic bags and heavy-duty freezer foil; even several layers of lighter weight options, like regular plastic wrap, won’t protect food adequately.
2. Remove air. Air draws out foods’ moisture and creates frost, causing nasty freezer burn and ice crystals. Use a straw to suck out as much air as possible; or invest in a vacuum sealer (about $100), which protects food for up to a year.