How to Seal custom Mylar Bags for Long-Term Food Storage
In today’s world, ensuring food longevity is more important than ever. If you need strong bags to store food or other items for a long time, Mylar bags are a great choice. These bags are great for preppers (emergency food storage), bulk food sellers (large quantity packaging), cannabis businesses (secure product protection). No matter what you need to store, Mylar bags will keep your items fresh and protected.
eople often find it hard to pick the best bags, seal them correctly, or use the right oxygen packs. Don’t know how to seal Mylar bags? This easy guide shows you simple sealing steps. No more air, moisture, or pests – just lasting freshness!
Table of Contents
Why custom Mylar Better than Other Storage Methods
Traditional food storage options all have following weaknesses:
- Plastic buckets let oxygen in over time.
- Glass jars are heavy and fragile.
- Vacuum bags can be punctured easily.
- Freezer storage relies on electricity.
Mylar bags solve these problems by:
- The aluminum oxide layer is 0.00025″ thick and creates a strong barrier.
- It provides protection for freeze-dried meats and sensitive medical supplies.
- One hundred sealed Mylar bags take up 40% less space than the same amount of canned goods.
Step by Step Sealing Process
- Prepare Your Supplies
Setting up your workspace properly makes the sealing process faster and easier.
- custom Mylar bags (food-grade, metalized layer)
- Oxygen absorbers (300cc for small bags; 2000cc for 5-gallon buckets)
- Heat-sealing tools (iron, hair straightener, or impulse sealer)
- Choose the Right Mylar Bags
Not all Mylar bags are created equal. Choose those bags with a thickness of 5-7 mil for durability. You can get Mylar bags in many sizes – from small ones for spices to big 5-gallon bags for storing lots of food. Make sure your bags are safe for food and have a metal lining for the best protection. - Fill the Bags Correctly
- Keep bags upright and dry.
- Fill with dry goods (rice, beans, flour), leaving 3-4 inches of headspace.
- Avoid overpacking—settle contents to remove air pockets.
Note: Do not use oxygen absorbers with sugar (causes clumping).
- Add Oxygen Absorbers
Place the oxygen absorber on top of the food. These absorbers are important as they take out oxygen, preventing spoilage and extending shelf life. Once exposed to air, it activates within hours, so work quickly.
Use the right size: generally, 300cc for small bags, 2,000cc for large buckets. Don’t reuse absorbers—they lose effectiveness after activation.
- Seal the custom Mylar Bag Properly
(1)Remove Air First
Gently press on the bag to push out as much air as possible before sealing. This helps keep your food fresh longer.
(2) Sealing the Bag
Fold about 1 inch (2-3 fingers width) of the top edge down
Use any of these to seal:
- Clothes iron (medium heat)
- Hair straightener
- Special bag sealer
(3) How to Seal
Slowly slide your hot tool across the folded edge. Go slowly to make sure it seals completely.
(4) Extra Protection
For important storage:
Seal a second time just below the first seal
Or use an impulse sealer (gives the strongest seal)
- Label the custom Mylar Bag
Labeling your Mylar bags is an essential step. Write on the bag with a marker: what’s inside, how to prepare it, and when you packed it. Doing this makes food rotation easier – you’ll use older products before newer ones. And then it will prevent mix-ups and reduce waste. - Store in a Cool, Dry Place
After sealing and labeling, store Mylar bags in a dark, temperature-stable environment. Keep your bags out of the sun and away from hot or cold spots – this helps your food stay fresh longer.And for best protection:
Store your sealed bags in food-safe plastic buckets.
Always use buckets with tight-sealing lids.
This keeps out pests like bugs and mice.
- Monitor and Maintain
Check your Mylar bags often. If you see any problems, fix them right away so your food doesn’t go bad. If a bag is torn or not sealed right:
Move the food to a new Mylar bag.
Add new oxygen absorber packs.
Seal it up tight.
Doing this helps your food stay fresh and tasty for much longer.
Why Mylar Bags Are the Best for Storing Food Long-Term
- Mylar bags keep your food fresh for years because:
- Blocks Air & Moisture – The metal lining stops oxygen and water from getting in (the main causes of spoilage).
- Protects from Light – No sunlight means no loss of nutrients or flavor.
- Pest-Proof – Bugs and rodents can’t chew through the tough material.
- Space-Saving – They’re flexible and stackable, unlike bulky cans or buckets.
- Eco-Friendly: Reusable and recyclable, Mylar bags meet the growing demand for sustainable packaging solutions.
Conclusion
By following the proper sealing Mylar bags’ steps, you can ensure that your food remains fresh and safe for months or even years. Whether you’re a retailer, prepper, or part of the cannabis industry, custom Mylar bags offer unmatched durability protection.
Ready to upgrade your packaging? Contact us today for high-quality, custom Mylar bags tailored to your needs. Keep your food safe with our strong, earth-friendly storage bags.