When it comes to protecting food, electronics, or valuables from moisture, oxygen, light, and pests, Mylar bags stand out as one of the most reliable and effective storage solutions available today. At our company, we understand the importance of long-term preservation, whether for emergency preparedness, commercial packaging, or personal use. In this comprehensive guide, we delve deep into everything you need to know about Mylar bags  including types, sizes, uses, and best practices.
What Are Mylar Bags?
Mylar is a brand name for biaxially-oriented polyethylene terephthalate (Bopped), a polyester film created by DuPont. It is known for its superior strength, chemical stability, and insulating properties.
Why Choose Mylar Bags for Storage?
Choosing Mylar bags provides unparalleled benefits:
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Oxygen Resistance: Paired with oxygen absorbers, bags remove virtually all oxygen, preserving freshness.
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Moisture Barrier: Prevents mold, mildew, and spoilage.
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Puncture Resistant: Strong and durable against wear and tear.
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Light Protection: Shields items from UV degradation.
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Pest Proof: Insects, rodents, and microbes can’t penetrate the sealed barrier.
Types of Mylar Bags
There are several types of bags depending on the intended use:
1. Standard Bags
These are the most common types used in food storage. They come in various thicknesses ranging from 3.5 mil to 7.5 mil. Thicker bags offer greater protection.
2. Ziplock Bags
Ideal for frequent access and resealing. These bags often come with resealable zippers but are less airtight over long-term storage unless heat-sealed.
3. Gusseted Bags
These bags expand at the bottom, allowing for larger capacity and self-standing structure. Perfect for bulk items like rice, flour, and grains.
4. Foil-Lined Bags
Enhanced for light and heat insulation, these are often used for sensitive electronics or high-value items.
Common Uses for Bags
1. Long-Term Food Storage
Freeze-dried meals, grains, beans, sugar, flour, pasta, and even dehydrated vegetables can last 10-25 years when properly sealed in Mylar with oxygen absorbers.
2. Emergency Preparedness
Essential for bug-out bags, survival kits, or disaster prep. Lightweight and compact, bags store efficiently in small spaces.
3. Commercial Food Packaging
Coffee roasters, tea sellers, and organic food companies rely on custom-printed Mylar bags for brand visibility and freshness.
4. Herbal and Pharmaceutical Storage
Keeps potency and purity intact by reducing light and oxygen exposure.
5. Electronics and Documents
Anti-static Mylar bags shield sensitive electronics and important papers from static electricity, moisture, and oxidation.
Mylar Bag Thickness: What You Need to Know
Thickness is measured in mils (1 mil = 0.001 inches):
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3.5 mil: Ideal for short- to mid-term storage.
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5 mil: Suitable for most household and emergency food storage.
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7-7.5 mil: Industrial-grade strength for long-term, high-security storage.
Thicker bags provide better protection, but may require stronger heat sealers.
How to Use Mylar Bags for Food Storage
Step 1: Choose the Right Bag Size and Thickness
Determine the quantity and type of food you plan to store. Choose a thickness based on the expected storage time and conditions.
Step 2: Use Oxygen Absorbers
Select the correct CC rating based on the bag size:
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1-quart bag → 100cc
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1-gallon bag → 300-500cc
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5-gallon bag → 2000-3000cc
Place the absorber on top of the food just before sealing.
Step 3: Seal the Bag
Use a heat sealer, clothing iron, or hair straightener. Make sure to:
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Leave an inch of space at the top.
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Press tightly and seal edge to edge.
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Perform a second seal for extra protection if needed.
Step 4: Store in a Cool, Dark Place
Mylar bags should be stored inside plastic buckets, totes, or bins to protect from rodents and punctures.
Shelf Life Expectations with Mylar Bags
Properly stored food in Mylar bags can last:
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White Rice: 25-30 years
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Wheat Berries: 30+ years
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Beans & Lentils: 25 years
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Pasta: 20 years
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Oats: 20-25 years
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Dehydrated Veggies/Fruits: 10-15 years
Always label each bag with the food type and packing date.
Conclusion
Mylar bags offer unmatched protection, longevity, and versatility for both personal and commercial use. Whether you’re building your emergency pantry, storing herbs for wellness, or launching a food brand, investing in quality Mylar bags ensures your goods remain fresh, safe, and shelf-stable for years to come.
