Mylar Bags for Long-Term Food Storage

Introduction To Mylar Bags For Long Term Food Storage

Mylar bags, also known as emergency food storage bags, are made from a type of polyester film known as BoPET (biaxially-oriented polyethylene terephthalate). This material is highly resistant to moisture, oxygen, and light, making it ideal for preserving the freshness and quality of stored food items.

Importance of Long-Term Food Storage

In uncertain times or during emergencies such as natural disasters or pandemics, having a reliable food supply can be crucial. Mylar bags for long-term food storage ensures that you have access to nourishing meals even when conventional sources are unavailable or limited.

Benefits of Mylar Bags

Oxygen Barrier

One of the key benefits of Mylar bags is their ability to create an oxygen barrier. Oxygen is a primary factor contributing to food spoilage, as it promotes the growth of bacteria, mold, and yeast. By sealing food items in Mylar bags with oxygen absorbers, you can significantly extend their shelf life.

Moisture Resistance

Mylar bags also provide excellent moisture resistance, preventing moisture from seeping into the contents and causing them to spoil or degrade. This feature is particularly important for preserving the flavor, texture, and nutritional value of stored food items.


Unlike traditional plastic bags or containers, Mylar bags are highly durable and puncture-resistant. They can withstand rough handling and are less likely to tear or rupture, ensuring that your stored food remains protected and intact.

Light Protection

Mylar bags are opaque and provide effective protection against light exposure. Light can accelerate the degradation of certain nutrients in food and cause discoloration or changes in taste. By storing food items in Mylar bags, you can shield them from harmful UV rays and maintain their quality over time.

Choosing the Right Mylar Bags

Size and Capacity

When selecting Mylar bags for long-term food storage, consider the size and capacity that best suits your needs. Choose bags that are large enough to accommodate your desired quantity of food items without overfilling or underutilizing space.

Thickness and Material

Mylar bags come in various thicknesses, typically measured in mils (thousandths of an inch). Thicker bags offer greater durability and puncture resistance, but they may also be bulkier and more challenging to handle. Consider the trade-offs between thickness and convenience when making your selection.

Ziplock vs. Heat Sealable

Some Mylar bags feature ziplock closures, allowing for easy access to stored items without the need for additional sealing equipment. Alternatively, heat-sealable bags require a heat sealer to create an airtight seal, offering maximum protection against oxygen and moisture intrusion.

Preparing Food for Mylar Bag Storage

Proper Food Selection

Not all foods are suitable for long-term storage in Mylar bags. Choose dry, low-moisture foods such as rice, beans, pasta, grains, and dehydrated fruits and vegetables. Avoid items with high moisture content, as they may spoil or create conditions conducive to microbial growth.

Oxygen Absorbers

Before packing food items into Mylar bags, it’s essential to remove as much oxygen as possible from the packaging. Oxygen absorbers, typically made from iron powder, react with oxygen to create a vacuum-like environment inside the bag, further extending the shelf life of the contents.

Vacuum Sealing

For optimal results, consider vacuum-sealing your food items before placing them in Mylar bags. Vacuum sealing removes excess air from the packaging, reducing the risk of oxidation and preserving the freshness and flavor of the stored food.

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Steps for Properly Packing Mylar Bags

Cleaning and Preparing Bags

Before filling Mylar bags with food items, ensure that they are clean, dry, and free from any contaminants or debris. Wipe the interior of the bags with a clean cloth or paper towel to remove any residue that could compromise the integrity of the seal.

Filling and Sealing Process

Carefully fill Mylar bags with the desired food items, leaving some space at the top for sealing. Remove any excess air from the bags by pressing down gently on the contents or using a vacuum sealer. Once filled, use a heat sealer or ziplock closure to secure the bags tightly.


To facilitate organization and inventory management, label each Mylar bag with the contents and the date of packaging. Use a permanent marker or adhesive labels to ensure that the information remains legible throughout the storage period.

Storing Mylar Bags

Ideal Conditions

Store Mylar bags in a cool, dark, and dry environment to prolong the shelf life of the contents. Avoid exposure to direct sunlight, extreme temperatures, and humidity, as these factors can accelerate degradation and compromise the integrity of the packaging.

Temperature and Humidity Considerations

Maintain a consistent temperature and humidity level in the storage area to minimize fluctuations that could impact the quality of the stored food items. Ideal conditions typically range from 50 to 70 degrees Fahrenheit with humidity levels below 15%.


When stored properly, food items in Mylar bags can remain viable for an extended period, ranging from several months to several years, depending on the type of food and storage conditions. Regularly inspect the bags for signs of damage or deterioration and rotate stock as needed to ensure freshness.