Mylar Bags for Freezer Storage: Dos and Don’ts

Think about buying meat or gathering many vegetables from the garden and putting them in the freezer. Over time, you use them to prepare food and notice they are completely covered in ice. They look very different compared to their original condition and taste less good. This phenomenon is called freezer burn, and it is caused by the presence of air in the product. This affects its quality and results in a waste of money. Many people have tried various materials like plastic wraps, plastic boxes, and regular freezer bags, but these do not prevent air from reaching the product in the long run. This is where quality custom Mylar bags come in.

Maybe you have even used some of these pouches before to store your emergency food or coffee beans. They are durable, opaque, and airtight, provided that they are used correctly. However, their usage differs in some aspects from one environment to another, and when done improperly, they may still render your food spoiled or even damage the satchels themselves. There are certain procedures to follow so that your food will stay fresh for a long time.

In this blog, we will explain the dos and don’ts of using printed Mylar pouches for freezer storage so you can save money and keep your food tasting great.

The Dos of Using Premium Mylar Bags for Freezer Storage

Once you choose to use Mylar packaging bags to store your food in the freezer, you are taking the right step in ensuring that your food lasts longer. But there are proper ways of doing this. Following the procedures below, you can make sure your food stays safe, tasty, and protected from the cold, dry air of the freezer.

• Choose the Right Bag Thickness

Not all Mylar bags are manufactured equally. When you are shopping for satchels, you will see numbers like 3.5 mil, 4.5 mil, or 7 mil. The "mil" is just a fancy word for the thickness of the bag. For a pantry shelf, a thinner bag might work okay. But a freezer is a very cold and challenging environment for food storage. The air inside a freezer is very dry, and things get shifted around. If you use a bag that is too thin, it can get small cracks or punctures over time.

For freezer storage, you should look for bags that are at least 4.5 mils thick. If you can find 7 mil bags, that is even better. Thicker satchels are stiff and hard to tear. They stand up better to the cold temperatures. When plastic gets cold, it can become brittle. A thick bag will stay flexible enough to handle without breaking. 

• Use Perfect-Sized Oxygen Absorbers

Mylar pouches are amazing; however, they will be effective if combined with an oxygen absorber. Oxygen absorbers are small iron packets that remove oxygen from a Mylar pouch to keep items fresh.

Why does this matter for the freezer? Although freezing reduces the speed of spoilage, oxygen remains the main enemy. It leads to freezer burn and spoils the taste of the product. Using an oxygen absorber helps to eliminate oxygen, which results in the burn. The bag usually shrinks tightly around the product, as if it is vacuum-sealed. That is just what you need. However, it is important to purchase the correct absorber size based on the bag’s volume. You can use custom smell proof mylar bags to help lock in odors while the absorber does its work.

• Let the Food Cool Before Storing It In the Bag

If you are cooking a meal to freeze, like chili or soup, do not put it straight into the Mylar pouch while it is hot. This is a big mistake. Why?

When hot food meets the inside of a bag, it creates steam. That steam turns into water droplets. If you seal the bag with that steam inside, you are trapping moisture.

Extra moisture is bad news. It can lead to ice crystals forming on the food. In a worst-case scenario, too much moisture can cause the food to spoil. That’s why let your food cool down first. This keeps the inside of the bag dry and the food in better condition.

• Always Double Seal the Bag for Safety

A heat sealer is the best tool, but if you are using custom mylar zip lock bags, make sure you press the seal tightly closed. An iron with a cloth over it works too, but a sealer is faster and easier. When you run the sealer across the top of the bag, do not just do it once.

Do a double seal. This means you seal the bag near the top, then move the sealer down a fraction of an inch and seal it again. Are you wondering why? Because sometimes a tiny hole might happen in one spot. If you have two seals, the chances of both failing at the same spot are very low. It acts as a backup. Also, make sure you leave enough room at the top of the bag. If you fill the bag to the very brim, you won't have any space to make a good seal. Leave two or three inches of space at the top so you can get a tight and clean closure.

The Don’ts of Using Mylar Bags for Freezer Storage

Now that we have got ideas what to do, let’s talk about the mistakes. Avoiding these errors is just as important as following the dos. If you make these mistakes, you might come back to find your food ruined or your satchels ripped open.

• Don’t Store Sharp-Edged Foods Without Protection

Mylar food bags are strong, but they are not invincible. If you are storing things with sharp edges or points, they can poke right through the bag. Think about things like bones in the meat. When these items shift around in the freezer, a sharp corner can press against the wall of the bag.

When the bag develops a small hole, air enters the bag. This air leakage reduces the effectiveness of the oxygen absorber, which may lead to food spoilage.  This is a good remedy for this problem: You may use custom parchment paper to cover the sharp item, or you may first place the sharp item in another plastic bag, then put it in the bag. Just like putting a pillow around a sharp rock.

• Don’t Reuse Bags for Raw Meat

We all like to save money and reuse things, but you have to be careful here. You might wash a Mylar bag that had dry beans or rice in it and use it again. That is usually fine if the bag is in good condition or shape. However, you should never reuse a bag that previously held raw meat, fish, or poultry.

Raw meat juices contain bacteria. Even if you wash the bag with hot water and soap, tiny bacteria can hide in the corners or get stuck in the bag. Mylar pouches have a shiny inside that is hard to scrub perfectly clean. If you put new food in a bag that still has hidden bacteria, you could get sick.

Use a brand-new, clean bag for raw meat. If you want to reuse satchels, only do it with dry or pre-packaged foods that are not raw. 

• Don’t Freeze Liquids in Mylar Bags Without Pre-Freezing 

If you put liquid like soup or broth directly into a standard Mylar pouch and seal it, you may face leaks or sealing issues. Even custom spout pouches need careful handling for a proper seal. Here is why: liquids expand when they freeze. Water expands when it turns into ice.

If you fill a Mylar packaging bag with liquid and seal it tightly, there is no room for that expansion. As the liquid freezes, it will push against the seams with a lot of force. The seal will likely pop open. At best, your bag will leak. At worst, it will burst open inside your freezer, creating a frozen mess that is very hard to clean up.

The right way to do this is to pre-freeze your liquids. Pour your soup into a regular plastic container or a Tupperware box. Put that in the freezer until it is rock solid. Then, take the frozen block of soup out of the container and pop it into the Mylar pouch. Now you can seal it. Since the liquid is already frozen, it won't expand any further, and your bag will stay safe.

Final Note!

Storing food in the freezer doesn't have to be a gamble with quality. By following these simple dos and don’ts, you can make sure your Mylar bags work best. It ranges from the selection of an appropriate thickness of the material to the exclusion of all air bubbles inside. This way, you can be sure that your food will taste good for several months. Forget about freezer burn and financial losses. With these tips, you are ready to stock your food with confidence, knowing your favorite foods are safe, protected, and ready to eat whenever you need them.

Now that you understand how to keep your food safe, finding the right satchels is the next big step. You cannot simply settle for cheap materials that might crack in the cold. You truly need a packaging partner who knows exactly how materials handle freezing temperatures. BoxLark provides top-quality Mylar packaging pouches specifically made to last. To get more information, you can visit the website or directly contact sales@boxlark.com.