Mylar Bags Uncovered: The Science Behind Their Protective Properties

When it comes to storing food, there are many options out there to keep it fresh and tasty. One popular option is the Mylar bag. Made of a polyester film, Mylar bags offer exceptional protection against the elements, such as light, air, and moisture. But what makes Mylar bags so effective in preserving food? In this article, we will delve into the science behind mylar bags and their protective properties.

First, let’s talk about the material that Mylar bags are made of. Mylar is actually a brand name for a type of polyester film made by DuPont. This film is incredibly strong and durable, with a high tensile and tear strength. This makes Mylar bags resistant to punctures and tearing, which helps to keep the contents inside safe and secure. Additionally, Mylar has excellent barrier properties, which means that it can prevent both air and moisture from getting in or out. This is important because air and moisture can cause food to spoil quickly, leading to the growth of bacteria and mold. By preventing these elements from getting in, Mylar bags can help to extend the shelf life of food.

Another key feature of Mylar bags is their ability to block out light. Mylar is an opaque material, which means that it does not allow any light to pass through it. This is important because exposure to light can cause food to deteriorate quickly. In particular, the ultraviolet (UV) rays in sunlight can cause food to break down and lose its nutrients. By blocking out light, Mylar bags can prevent this from happening, keeping food fresh and nutritious for longer.

In addition to its protective properties, Mylar is also a versatile material that can be used in a wide range of applications. In addition to food storage, Mylar bags are commonly used in electronics, as well as for packaging and shipping products that need to be protected from the elements. Mylar is even used in space travel, as it can provide insulation and protection against the extreme conditions of space. This demonstrates just how durable and reliable Mylar bags can be.

When it comes to using Mylar bags for food storage, there are a few things to keep in mind. First, it’s important to choose bags with a thickness of at least 5 mil, as this will provide the most effective protection against the elements. Additionally, it’s a good idea to use oxygen absorbers in Mylar bags when storing food for long periods of time. This will help to remove any remaining oxygen from the bag, which can further help to preserve the food.

Mylar bags are known to be the best way to store food and other sensitive items. Their protective properties help keep the contents fresh for longer periods of time compared to traditional storage methods. However, what exactly makes mylar bags so effective? In this blog post, we uncover the science behind the protective properties of mylar bags.

Mylar bags are made of polyester film that has been coated with aluminum. This combination creates a barrier that protects the contents from moisture, air, and light. The aluminum coating reflects light and heat, while the polyester film provides a durable layer that is resistant to tears and punctures. The thickness of the mylar bag determines the strength of the barrier, with thicker bags providing more protection against external factors.

One of the main reasons why mylar bags are so effective is that they are airtight. The barrier created by the aluminum and polyester film prevents oxygen from entering the bag, which inhibits the growth of bacteria and fungi. Food stored in mylar bags can last up to 25 years. In contrast, food stored in traditional storage methods can only last for a few months.

Mylar bags also have a low water vapor transmission rate (WVTR). This means that the bags are resistant to moisture. The barrier created by the polyester film and aluminum coating prevents water molecules from entering the bag, which protects the contents from humidity and mold growth. Food stored in mylar bags can retain their taste, texture, and nutritional value for longer periods of time because they are not exposed to moisture.

Another factor that makes mylar bags effective is that they are opaque. This means that they block out light, which can damage the contents of the bag. Light exposure can cause nutrients to break down and can also cause discoloration. Mylar bags protect the contents from light exposure, which maintains their quality and freshness.

Mylar bags are also easy to store. They are lightweight, durable, and take up minimal space. Unlike traditional storage methods, such as mason jars or plastic containers, mylar bags do not require extra space for storing or stacking. They can be stored in a closet or on a shelf, taking up minimal space and saving storage space for other items.


In conclusion, Mylar bags are an excellent option for storing food and other products that need to be protected from the elements. With their strong and durable material, excellent barrier properties, and ability to block out light, Mylar bags can help to extend the shelf life of food and prevent spoilage. Additionally, their versatility makes them an ideal choice for a wide range of applications, from electronics to space travel. So, if you’re looking for a reliable and effective way to store your food, consider investing in Mylar bags today.

In conclusion, the science behind the protective properties of mylar bags is simple yet effective. Mylar bags are airtight, resistant to moisture, opaque, and easy to store. These properties make them the best way to store food and other sensitive items for longer periods of time. With the rise of prepping, and survivalism storing food and other items in Mylar bags is becoming increasingly popular. Plus, given that our changing climate has seen more natural disasters over the past decade, having food stored in Mylar bags for long term survival is becoming a wise practice. The effectiveness of mylar bags make it an ideal option for those who want to prepare for emergencies or those who want to continue eating fresh foods without waste.


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