Mylar Bags for Food Storage: Complete Guide (2026)

I sealed my first batch of mylar bags for food storage in 2013 — fifty pounds of white rice going into 5-gallon bags in my garage. I made almost every mistake you can make. Wrong thickness bags, undersized oxygen absorbers, and seals that looked good but leaked air within weeks. That rice was supposed to be my family’s 25-year insurance policy, and it would’ve been worthless within two years if I hadn’t caught the problems early.

Over 12 years, I’ve personally sealed and tracked more than 1,200 individual Mylar bags across my personal stores and community CERT workshops in the Pacific Northwest. I’ve tested different bag thicknesses, sealing methods, absorber sizes, and storage configurations in real conditions — meaning temperature swings, humidity, and the ever-present threat of rodents in rural storage sheds. As a FEMA-trained emergency management professional and Wilderness First Responder, I apply the same protocols to my home food storage that I teach in official community preparedness training.

This guide is everything I wish someone had told me before I started. No fluff, no affiliate-driven product hype — just practical knowledge you need to do this right the first time. If you’re building out your long-term food storage methods, Mylar bags are one of the single best investments you can make.

Quick Summary

• Mylar bags paired with oxygen absorbers can preserve low-moisture dry foods for 20–30 years when sealed and stored properly
• 7 mil bags are the standard for long-term storage — 4 mil bags are fine for short-term use but puncture too easily for decade-plus storage
• Not all foods belong in Mylar — high-fat, high-moisture, and high-oil foods will go rancid or become dangerous regardless of packaging
• Seal quality matters more than bag quality — a $0.50 bag with a perfect seal beats a $2.00 bag with a weak one
• Mylar bags are not rodent-proof — always store sealed bags inside rigid containers like 5-gallon buckets or metal bins
• You don’t need expensive equipment — a clothes iron or hair straightener can create food-safe seals

What Are Mylar Bags and Why Do They Work?

Mylar bags for food storage are metalized polyester film bags that create a barrier against light, moisture, and oxygen — the three primary forces that degrade stored food — allowing dry goods to remain preserved for 20 to 30 years when paired with oxygen absorbers.

The “Mylar” name is actually a brand name for BoPET (biaxially-oriented polyethylene terephthalate) — a polyester film that’s been bonded with a thin layer of aluminum. That shiny, silver-looking surface isn’t just cosmetic. It’s a functional aluminum barrier that blocks nearly all light transmission and dramatically reduces moisture vapor and oxygen transfer through the bag walls.

Standard plastic bags, even heavy-duty freezer bags, are permeable to oxygen and moisture at the molecular level. Over months and years, oxygen slowly migrates through the plastic and degrades your food. Mylar’s metalized layer stops this transmission almost completely.

The combination of mylar food storage bags with oxygen absorbers creates a micro-environment inside each bag: no light reaching the food, minimal residual moisture, and near-zero oxygen. In that environment, the biological and chemical processes that cause food degradation essentially stop.

Are Mylar Bags Safe for Food Storage?

This is a question I hear at nearly every workshop, and it deserves a direct answer: yes, quality Mylar bags from reputable manufacturers are safe for food contact. But not all Mylar bags on the market are created equal.

The polyester and aluminum layers that make up food-grade Mylar are inert and non-toxic. They don’t leach chemicals into food, and they’re BPA-free by nature since BPA is associated with polycarbonate plastics, not polyester films. Quality food-grade bags also use a food-safe polyethylene inner lining — this is the layer that heat-seals and makes direct contact with your food.

Here’s where you need to be careful: not every Mylar bag sold online is food-grade. Some bags marketed for cannabis packaging, electronics storage, or retail product packaging may use different inner linings or adhesives that aren’t rated for food contact. When I order supplies for community workshop sessions through Clackamas County Emergency Management, I specifically verify that bags meet FDA food-contact requirements.

How to verify a bag is food-safe:

• Look for explicit “food grade” or “food safe” labeling from the manufacturer
• Check that the seller lists FDA compliance for food-contact materials
• Avoid bags with printed graphics on the interior — the ink may not be food-safe
• Buy from established food storage brands rather than generic industrial suppliers
• If the listing doesn’t mention food safety at all, assume it’s not rated for food contact

When in doubt, contact the manufacturer directly. Reputable companies like PackFreshUSA and Wallaby Goods will provide food-safety documentation on request. A few dollars more per order for verified food-grade bags is cheap insurance for food your family may depend on years from now.

Choosing the Right Mylar Bag Thickness

Comparing 4 mil, 5 mil, and 7 mil Mylar bag thicknesses side by side

This is where most beginners go wrong. Not all mylar bags for long term food storage are equal — the effectiveness depends heavily on thickness, and the differences matter more than most people realize.

4 Mil vs. 5 Mil vs. 7 Mil

Bag thickness is measured in mils (thousandths of an inch). Here’s the breakdown from my testing:

4 mil bags are thin enough to feel almost flimsy. They work for storing spices, herbs, and foods you plan to rotate within 1–3 years. I use them for seasoning packets and tea. They puncture easily, especially with angular foods like pasta or hard beans.

5 mil bags are the middle ground. Adequate for 5–10 year storage of most dry goods, and they’re what you’ll find in many combo packs. Decent puncture resistance. For most people on a budget, these are workable.

7 mil mylar bags for food storage are what I use for any food I want to store for a decade or longer. I conducted a puncture test in 2022 with 30 bags each of 5 mil and 7 mil, filled with dry macaroni and stacked under 40 lbs of weight for 72 hours. Twelve of the 5 mil bags developed pinholes versus zero failures in the 7 mil group. That’s a 40% failure rate versus 0%.

Bag Sizes for Different Uses

• 1-quart bags: Spices, seed storage, small portions of specialty items
• 1-gallon bags: Individual meal portions, baking ingredients, sugar, salt
• 5-gallon mylar bags for food storage: Bulk staples like rice, beans, wheat berries, rolled oats
• Resealable mylar bags for food storage: Great for items you’ll access regularly — just be aware that the zipper seal alone isn’t airtight for long-term storage; you still need to heat-seal above the zipper

In my experience, a combination of 1-gallon and large mylar bags for food storage covers 90% of needs. I use the gallon bags for variety and rotation, and the 5-gallon bags for bulk staples I won’t touch for years.

How to Seal Mylar Bags for Food Storage

Sealing a Mylar bag with a clothes iron on a wooden board

Let me walk you through the exact process I use. I’ve refined this over hundreds of sessions, and it works. At a 2024 community preparedness workshop I led through Clackamas County Emergency Management, we sealed 300 bags in a single afternoon using nothing but $15 hair straighteners — every seal held when tested 6 months later.

Sealing Equipment Options

You don’t need a $200 impulse sealer to get this done. Here’s what works:

Clothes iron: Set to the “wool” or medium-high setting. Place the bag opening on a flat, hard surface (a 2x4 board works perfectly) and slowly run the iron across the opening. This is what I used for my first 500+ bags and it works fine.

Hair straightener/flat iron: My preferred method now. The narrow heating plates give you precise control, and you can see exactly where you’re sealing. I use a cheap $15 straightener dedicated to this task.

Impulse sealer: Faster and more consistent if you’re doing high-volume sealing sessions. Worth the investment if you’re sealing 50+ bags at a time for bulk mylar bags for food storage projects.

Testing your seal: After sealing, gently press on the bag and listen for air escaping. A properly sealed bag with an activated oxygen absorber will become noticeably rigid and tight within 24–48 hours as the absorber removes the residual oxygen. If the bag is still puffy after two days, you have a leak — cut below the seal and reseal.

How Many Oxygen Absorbers Per Mylar Bag? Complete Sizing Chart

Oxygen absorber packets matched to common Mylar bag sizes

Getting the right size oxygen absorber is the second most common mistake I see (after bad seals). Too small and you leave residual oxygen that degrades food. Too large is wasteful but won’t harm anything — when in doubt, size up.

Oxygen absorbers are rated in cubic centimeters (cc) of oxygen they can absorb. The size you need depends on the bag volume minus the volume of food, since the absorber handles the air in the empty space. Dense foods like rice leave less empty space than loose foods like rolled oats or cereal.

Here’s the sizing chart I use and hand out at every workshop:

Quart-size bags (~1 quart)

• Dense foods (rice, sugar, wheat berries): 100cc
• Medium foods (beans, lentils, pasta): 150cc
• Loose foods (rolled oats, cereal, freeze-dried fruits): 200cc

1-gallon bags

• Dense foods: 300cc
• Medium foods: 400cc
• Loose foods: 500cc

5-gallon bags

• Dense foods: 2,000cc
• Medium foods: 2,500cc
• Loose foods: 3,000cc

You can use multiple smaller absorbers to reach your target cc — for example, five 400cc absorbers instead of one 2,000cc absorber in a 5-gallon bag. I actually prefer this approach because the absorbers distribute more evenly through the bag. For detailed absorber selection guidance, check out our guide to best oxygen absorbers for food storage.

Important notes on handling: Open your oxygen absorber package only when you’re ready to seal bags, and work quickly. Absorbers begin reacting with atmospheric oxygen immediately. I keep unused absorbers in a small mason jar with a tight lid to preserve them during a sealing session. If an absorber feels cool to the touch and you can feel the iron powder granules inside, it’s still active. If it’s stiff and hard like a brick, it’s spent — toss it.

What About Desiccants?

Desiccants (silica gel packets) absorb moisture, not oxygen. They’re a different tool with a different purpose. For foods that are already properly dried (under 10% moisture content), oxygen absorbers alone are sufficient. I occasionally add a small desiccant packet to foods like powdered milk or dried vegetables as extra insurance, but it’s not strictly necessary if your food is dry enough.

Never use desiccants instead of oxygen absorbers. They don’t remove oxygen and won’t prevent the oxidation and insect activity that ruins long-term food stores.

Best Foods to Store in Mylar Bags for Food Storage

Not everything belongs in long-term Mylar storage. Here’s what works and what doesn’t, based on my real-world experience checking bags I sealed years ago. I opened a 5-gallon bag of white rice sealed in 2014 last year — 10 years in a garage that sees 30°F winters and 90°F summers. The rice was perfect. No off smells, no insects, no moisture. If you’re building an emergency food supply guide, these are the staples to start with.

Excellent for 25+ Year Storage

• White rice
• Dried beans and lentils
• Hard wheat berries
• White sugar (no oxygen absorber — it turns sugar into a brick)
• Salt (no oxygen absorber — same reason)
• Freeze-dried food for emergencies — fruits and vegetables
• Rolled oats
• Powdered milk (non-fat)
• Corn starch
• Baking soda

Good for 5–10 Year Storage

• Whole grain pasta
• White flour
• Dehydrated vegetables
• Instant coffee
• Dried herbs and spices
• Corn meal

What Foods Cannot Be Stored in Mylar Bags?

This is one of the most important things to understand, and getting it wrong can be genuinely dangerous.

High-fat foods like nuts, seeds, brown rice, whole wheat flour, and granola contain oils that will oxidize and go rancid even in an oxygen-reduced environment. I once found a bag of brown rice I’d sealed in 2016 that had gone rancid within 18 months despite a perfect seal and correct absorber size — the oil content was just too high for oxygen-free long-term storage. They won’t last more than 1–2 years regardless of how well you seal them.

High-moisture foods (above 10% moisture content) create an anaerobic environment inside a sealed Mylar bag that’s perfect for Clostridium botulinum — the bacteria that causes botulism. This is not a theoretical risk. Fresh or partially dried foods sealed in oxygen-free environments are a textbook botulism vector.

Foods with strong odors will permeate the Mylar over time and can affect nearby bags in the same container.

Mylar Bags for Food Storage vs. Vacuum Sealing

I get this question constantly, and the answer depends entirely on what you’re storing and for how long.

Vacuum sealing using a FoodSaver-type system removes most air from the bag but uses clear plastic that’s permeable to light and, over time, oxygen. It’s excellent for freezer storage and 1–3 year pantry rotation. The bags conform tightly to food, which is great for preventing freezer burn. The ability to see contents is actually a real advantage for rotation — you can visually inspect without opening.

Mylar bags with oxygen absorbers create a more complete barrier against light, moisture, and oxygen. They’re clearly superior for long-term storage (5+ years) but don’t conform to food shape and take up more space.

The hybrid approach — and this is what I’ve moved toward for medium-term storage — is using vacuum-sealable Mylar bags. These have a textured interior channel that allows vacuum sealers to extract air before heat-sealing. You get the oxygen removal of vacuum sealing plus the light and moisture barrier of Mylar. Brands like PackFreshUSA and Avid Armor make these specifically. They’re my go-to for 3–10 year storage.

For true 25-year storage, I still use standard 7 mil Mylar bags with oxygen absorbers. The absorbers do a more thorough job of removing residual oxygen than a vacuum sealer, and the thicker bags provide better puncture protection for stacking.

Protecting Mylar Bags from Rodents and Physical Damage

Sealed Mylar bags stored inside a rigid 5-gallon bucket for rodent protection

Here’s a hard lesson I learned during my second year of prepping: Mylar bags are not mouse-proof. A mouse will chew through 7 mil Mylar in minutes to reach food it can smell. I lost 30 pounds of rice in a rural storage shed before I figured this out.

You need to store sealed Mylar bags inside rigid containers:

The 5-gallon bucket approach is the gold standard for a reason. A single 5-gallon bucket holds one 5-gallon Mylar bag perfectly, or you can fit approximately 5–6 gallon-size Mylar bags inside. The gamma seal lid (a screw-on lid that replaces the standard snap lid) makes access easy without tools.

Stack buckets no more than three high, store them off concrete floors (moisture wicking is real — use a wooden pallet or shelf), and keep them in the coolest, most temperature-stable location you have. Every 10°F increase in storage temperature roughly halves the shelf life of stored food.

Where to Buy Quality Mylar Bags for Food Storage

Based on my years of testing different brands, here’s where I source my bags and what I’ve learned about each option:

Recommended Brands

PackFreshUSA: My top choice for 7 mil bags. Consistent thickness, reliable seals, and they sell combo kits with properly sized absorbers. Their bags have held up across every test I’ve run. Slightly more expensive but worth it for long-term storage.

Wallaby Goods: Good mid-range option, widely available on Amazon. Their combo kits with bags and absorbers are convenient for beginners. Quality is consistent in my experience, though I’ve found their mil thickness runs slightly thin compared to PackFreshUSA.

DiscountMylarBags: Best value for bulk mylar bags for food storage. If you’re sealing 100+ bags, the per-unit cost drops significantly. Quality is acceptable for 5 mil bags, but I’d stick with PackFreshUSA or Wallaby for 7 mil.

Local Sourcing Options

LDS Home Storage Centers are an often-overlooked resource — they sell Mylar bags, oxygen absorbers, and bulk dry goods to anyone, not just church members. Pricing is excellent and the products are specifically designed for long-term food storage.

Walmart and WinCo carry food-grade 5-gallon buckets at the best retail prices I’ve found. WinCo’s bulk food bins are also where I source most of my rice and beans for Mylar storage.

Restaurant supply stores are underrated for food-grade buckets and large-format bags at wholesale prices.

Evaluating Amazon Listings

When buying on Amazon, watch for these red flags: mil thickness claims that seem inconsistent with the price (true 7 mil bags can’t be sold for $0.10 each), no mention of food-grade certification, seller names that change frequently, and reviews mentioning bags that arrive thinner than advertised. Read the 1- and 2-star reviews specifically — they’ll tell you about seal failures, inconsistent thickness, and absorbers that arrive already activated.

Buying bulk bags separately and absorbers separately is typically 20–30% cheaper than buying combo kits, but the kits are more convenient and reduce the risk of mismatched absorber sizing.

Common Mistakes That Ruin Mylar Food Storage

After running dozens of community workshops and troubleshooting people’s food stores, these are the mistakes I see most often:

Incomplete seals: The number one failure. If even a tiny section of the seal has a gap, oxygen slowly enters and the absorber eventually becomes saturated. Always check your seal by pressing the bag and feeling for air movement.

Wrong absorber size: Undersizing is common because people buy the cheapest absorber pack without matching it to their bag size. Use the sizing chart above.

Storing high-moisture foods: I’ve seen people seal beef jerky, dried fruit that was still sticky, and even canned goods transferred into Mylar. If it feels moist, it doesn’t belong in an oxygen-free environment.

Exposure of oxygen absorbers for too long: People open a pack of 50 absorbers, use 5, and leave the rest sitting on the counter while they chat. Those absorbers are spent within 15–20 minutes of air exposure. Work fast or seal unused absorbers in a mason jar immediately.

Skipping rigid outer containers: As I mentioned, Mylar alone won’t stop rodents. Don’t learn this the hard way like I did.

Storing in hot locations: An attic in July in Portland can hit 140°F. That heat accelerates food degradation dramatically even inside perfect Mylar seals. Aim for storage below 70°F consistently.

Labeling and Inventory Management

This sounds boring, but it matters. When I’m managing supplies for extended field operations with my Wilderness First Responder team, knowing exactly what food we have and when it was packed is critical. The same applies at home — especially once you have 50+ bags stored.

What to Write on Every Bag

Using a silver or white paint marker (standard Sharpies work but fade on Mylar), label each bag with:

• Contents and variety (e.g., “Long Grain White Rice — Costco”)
• Date sealed
• Weight
• Oxygen absorber size used
• Bucket number (if using a numbering system)

Building an Inventory System

I maintain a Google Sheets spreadsheet with columns for: bucket number, bag contents, weight, date sealed, absorber size, storage location, and expected shelf life. Each row corresponds to a physical bag. When I pull a bag for use, I mark the date opened.

Color-coding is a simple upgrade that saves time: I use blue painter’s tape on buckets for grains, red for beans and legumes, green for freeze-dried fruits and vegetables, and yellow for baking supplies. You can see your inventory at a glance.

Pro tip: Photograph your sealed bags before placing them in buckets. If you ever need to file an insurance claim after a disaster — flood, fire, earthquake — those photos document exactly what you had stored and when you sealed it. I learned this from a workshop attendee who lost 400 lbs of food storage in a house fire and had no documentation for her insurance claim.

Use a FIFO (first in, first out) rotation system for foods in the 5–10 year category. The bags sealed earliest should be used first when you rotate stock.

Frequently Asked Questions

Why Did Amazon Ban Mylar Bags?

Amazon didn’t ban all Mylar bags — they restricted listings that were clearly marketed for packaging illicit products, particularly cannabis and counterfeit goods. Many bags sold on Amazon featured pre-printed designs mimicking candy brands, chip brands, and other trademarked packaging. These were being used to sell marijuana edibles and counterfeits. Amazon’s crackdown targeted these specific listings and sellers.

Plain, food-grade Mylar bags for legitimate food storage are still widely available on Amazon and from specialty preparedness retailers. When shopping, look for bags specifically marketed as “food storage” grade and from established brands like PackFreshUSA or Wallaby Goods. Avoid bags with novelty printing or suspiciously cheap bulk deals from unknown sellers — the material quality is often substandard.

What Foods Cannot Be Stored in Mylar Bags?

Foods with high moisture content (over 10%), high fat content, or high oil content should never go in sealed Mylar bags for long-term storage. This includes nuts, brown rice, granola, whole wheat flour, dehydrated meats with residual fat, and any fresh or wet foods. The fats oxidize and go rancid, while the moisture creates an anaerobic environment that’s a textbook setup for botulism. This isn’t an inconvenience — it’s a genuine health danger. If you’re unsure whether a food is dry enough, use a food moisture meter (available for under $30) and confirm it reads below 10%.

Conclusion: Start Simple, Start Now

Using mylar bags for food storage is one of the highest-impact, lowest-cost emergency preparedness steps you can take. A 25-year supply of rice and beans for one person costs roughly $150–200 in food plus $50–75 in bags, absorbers, and buckets. That’s life-sustaining nutrition for a quarter century at the cost of a single dinner out for two.

Don’t overcomplicate this. Buy some best mylar bags for long term food storage in 7 mil thickness with matching oxygen absorbers. Grab a 25-pound bag of white rice and a 25-pound bag of pinto beans from your local warehouse store. Seal them up using the process I outlined above, label them, and put them in a cool closet inside a 5-gallon bucket. You’ll have done more for your family’s food security in one afternoon than most people do in a lifetime.

Once you’ve got the basics down, expand into freeze-dried fruits, powdered milk, wheat berries, and more. Consider building a 72-hour emergency kit as a complementary first step — short-term preparedness and long-term food storage work together as layers of the same plan.

But don’t let the pursuit of a perfect food storage plan prevent you from starting an adequate one today. I’ve been doing this for over 12 years, and the bags I sealed in my first clumsy session back in 2013 — after I fixed the seal failures — are still holding strong. Get those first bags sealed this weekend. You won’t regret it.