Many people question: Can you store cereal in Mylar bags? The answer is: Yes, and when done correctly, it is one of the best ways to extend the life of cereal far beyond the original box.

Many pantry staples are considered shelf-stable; however, cereal is an item that has the potential to change its status quickly without warning. One minute it will be crispy and full of flavor, but the next minute it will be stale and/or smell bad. 

Mylar bags are a popular method of long-term food storage because they provide a barrier to light, oxygen, and moisture; the three things that cause cereals to spoil over time. When cereals are sealed properly in Mylar bags, especially with oxygen absorbers, they can remain crisp, flavorful, and protected from pest infestation in a pantry.

"Low-moisture foods such as cereal remain shelf-stable primarily because of reduced water activity, but exposure to oxygen and humidity can still lead to staling and quality loss. Packaging that limits oxygen ingress and moisture migration significantly helps preserve texture and flavor during storage." - Dr. Theodore P. Labuza, Food Shelf Life Researcher

Why Cardboard Cereal Boxes Fail Over Time

Cereal packaging is focused on ease of use and not on keeping your cereal fresh. Cardboard is porous, the liner material is thin, and once you open the box, air and moisture can flow in and out of the package with ease. This causes a lot of issues for cereals.

1. Being exposed to moisture creates a stale texture
2. Exposing cereal to too much air causes a loss of flavor
3. It allows insect infestation such as pantry moths
4. It allows cereal to spoil faster in warmer and more humid areas

Rolling the bag down and clipping it shut are not very effective in preventing oxygen from entering the bag. Over time, cereal products will deteriorate rapidly.

Why Mylar Bags Are Ideal for Storing Cereal

Mylar bags consist of multiple layers of polyester and aluminum that create a robust barrier against moisture, air, and light. The combination of these materials is important above all when it comes to storing cereal. Fresh, crunchy cereal can be kept in Mylar bags as long as they are sealed and the absorption of oxygen is eliminated by adding oxygen absorbers, which removes its main causes of decay.

There are significant benefits to using Mylar bags for storing cereals; they include:

- Maintaining the freshness and crunchiness of cereal.
- Preventing the loss of flavor due to oxidation of the product.
- Blocking the light that will damage the vitamins in the cereals.
- Preventing pest damage.
- Extending the storage life of the cereal from months to years.

Mylar bags provide effective storage for all types of cereals, including corn flakes, oat cereals, rice cereals, bran flakes, and even sugars in cereals.

Mylar bags are made from layered materials that block oxygen, light, and moisture, which is exactly how Mylar bags work to preserve food freshness long term.

How Long Does Cereal Last in Mylar Bags?

How long does cereal stored in Mylar bags keep for?

The longevity of cereal depends on the type of cereal, how it was sealed, and the conditions under which it is stored. If your cereal is put into Mylar bags with an oxygen absorber and stored in a cool, dry place, it will typically remain edible for between 5 and 10 years.

In general, here's what you can expect:

• Low-fat cereals, such as rice-based or corn-based cereals: up to 10 years.
• Whole grain cereals with more fat content (more oil) than other cereals: 5-7 years.
• Granola or nut-based cereals: typically 2-4 years.

Temperature is an important factor as well. In general, the cooler the storage temperature for cereal, the longer the cereal will last. Heat is an enemy of cereal; it accelerates the breakdown of oils, even in Mylar bags.

Step by Step: How to Store Cereal in Mylar Bags

When you store dry cereal in Mylar bags, it seems quite simple; however, there are many details to consider if you want good results. Here are some steps to take to achieve great results:

1. Use the correct thickness Mylar bag, at least 5 mil
2. Pour your cereal directly into the Mylar bag, leaving enough headspace at the top.
3. Use the appropriate size oxygen absorber for your cereal stored in the Mylar bag; 300-500cc for a gallon bag.
4. Shake gently or lightly agitate the Mylar bag after pouring in dried cereal to let contents settle.
5. Seal completely with either an iron or impulse heat sealer.
6. Write/type the name of the cereal and date on the Mylar bag.

To further protect your Mylar bags from moisture and other elements, place them inside food-grade buckets with lids for additional moisture protection.

Do You Need Oxygen Absorbers for Cereal?

If you want to store food for a long time, use oxygen absorbers. Oxygen absorbers will take out the air from in the bag, stopping the cereal from being oxidized or infested by bugs or insects. Even without using an oxygen absorber, a bag of cereal will last longer than in a box, but will not last nearly as long as a bag of cereal with an oxygen absorber.
Oxygen absorbers are very important for:

1) Whole grain cereal
2) Cereal stored for greater than one year
3) Emergency food storage
4) Hot/humid environments

Do not use desiccant packs instead of oxygen absorbers to control the humidity, as they only control moisture and not oxygen.

Why Cereal Brands are Switching to Printed Mylar Bags

Cereal manufacturers use printed Mylar bags to provide their products with an unparalleled level of protection from environmental elements that could ruin their goods. The use of Mylar allows cereal manufacturers to keep cereal crisp, fresh, and flavorful longer than they could with typical cardboard boxes or thin plastic packaging. 

By providing consumers with a very high level of quality and reducing the number of instances where consumers return stale cereal due to spoilage while in transit from the manufacturer to the bowl, manufacturers will be able to provide consumers with a more desirable product and build up stronger brand loyalty among consumers.

In addition to the superior level of protection provided by Mylar, printed mylar bags will provide manufacturers with an essential tool for creating a greater visual impact for their product. Most products packaged in Mylar are brightly colored with high-quality images printed using high-resolution printing processes, which allows manufacturers to accurately present the product label design, communicate critical product information, and attract the attention of consumers amongst many competing products on display in retail locations.

As packaging plays a very significant role in branding a manufacturer’s products, many manufacturers choose to use printed Mylar as a method of distinguishing themselves from competitors and enhancing their corporate image while at the same time creating a stronger connection to their consumer.

What Types of Cereal Store Best in Mylar Bags?

There is a wide range of cereal types that will store effectively long term. Some cereals are better than others when it comes to long term storage.

Best cereals for Mylar storage:

Plain cornflakes
Rice-based cereals
Oat rings/puffed grains
Bran flakes with no oils added

Cereals that contain higher fat amounts, chocolate coatings, nuts, or dehydrated fruits generally have a shorter shelf life, even in Mylar. However, they can still be stored using Mylar.

Is Storing Cereal in Mylar Bags Worth It?

If you're purchasing cereal in large quantities to save money or reduce waste, or stock piling cereal for your future pantry or emergency, Mylar bags are definitely worth it. They out perform plastic containers, zip-lock bags, and the original packaging by a wide margin. 

Families, businesses, preppers, campers, or anyone tired of throwing out boxes of cereal that only have half eaten cereals in them should get into the habit of using Mylar bags for these reasons. By sealing the cereal in a Mylar bag, the cereal maintains its texture when you open it again (crunchy, fresh, and ready to eat).

Unlike vacuum sealing, which can still allow light and oxygen transfer over time, Mylar creates a true barrier. If you are comparing storage options, this breakdown of Are Mylar Bags Better Than Vacuum Bags? explains the differences in long term protection.

So Can You Store Cereal in Mylar Bags? 

Yes, you can store cereal in Mylar bags. It is one of the smartest storage upgrades you can make. With proper sealing and oxygen absorbers, cereal can last for years instead of weeks. It saves money, reduces waste, and gives peace of mind knowing your food is protected.