The type of container you use to freeze strawberries depends on how much space you have in your freezer and the type of containers you have access to. If you’re avoiding plastic, opt for freezer-safe jars. Freezer-safe freezer bags are more flexible if you’re tight on space. They’re also more likely to have the shortest freezer life since it may be hard to get all the air out of the bag. Vacuum sealing is helpful if you do not plan on using your berries for a few months and all at once.
You have options, but the most important requirement about your container is removing air from it.