Summarize the following:
These bags are usually thicker and more durable than your average sandwich bag. If you are freezing a lot of soup, consider using different sized bags for different portion sizes, such as gallons and quarts. Plastic bags will save space in your freezer. If you are hesitant about using plastic bags and don't care about saving space, use a plastic box with a tight-fitting lid instead. Write the name of the soup and the date using a permanent marker. Frozen soup will not last forever, and needs to be used within a certain amount of time. Dairy-based soups will only last 2 months, while broth-based soups will last 3 months. Any longer, and the taste and texture will be compromised. This will hold the bag stable. Make sure that the jar is large enough to hold the bag. If you are using a plastic container, set the container down on a stable surface. Use a ladle to transfer the soup from the pot to the bag. If you are using a plastic container, leave ½ to 1 inch (1.27 to 2.54 centimeters) of space between the soup and the lid. This will allow for the soup to expand while freezing. It will also reduce the chances of freezer burn. Pull the bag out of the jar, and squeeze out as much air as you can. An easy way to do this is to close the bag most of the way, and then to press the air out. Seal the bag tightly. If you are using a plastic container, simply place the lid on tightly. Lay the bag(s) flat on the bottom of the freezer. When they freeze and become solid, you can stack them to save space. If you are using plastic containers, you don't have to wait for the soup to freeze. You can simply stack them from the start. Soups that contain grains and starches, such as beans, pasta, or potatoes, can go mushy. To keep this from happening, place the soup towards the back of the freezer. The temperature is most consistent there.

Summary:
Choose a plastic, re-sealable, freezer-safe bag. Label the bag. Place the bag into a jar, and flip the top edges over the mouth of the jar. Fill the bag with the soup. Seal the bag. Place the soup into the freezer.