One of the most common questions people ask before using mylar is simple but important: can you reseal Mylar bags after opening them?
Yes, you can reseal mylar bags. When it’s done the right way, resealing Mylar bags helps preserve freshness, extend shelf life, and protect contents from moisture, oxygen, and light.
These days, Mylar bags can be found in all kinds of places. Food storage, supplements, pet food, emergencies, retail packaging and collectibles. This guide will show you how resealing works, which options are the best to use and when resealing makes sense.
What Makes Mylar Bags Resealable?
Mylar bags, made of multiple layers, obtain their impressive barrier capabilities from this construction.
The ability to reseal them depends on:
• Heat sealable top layers
• Optional resealable zipper closures
Most Mylar bags come heat-sealed when manufactured. After opening the bag, it may still be heated to hermetically seal again or be repeatedly closed if the bag is equipped with a zipper.
Since not all mylar pouches and custom Mylar bags are manufactured in the same way, the type of method you choose will also influence how you use them.
How to Reseal Mylar Bags Using Heat
Using a heat sealer is the best way to reseal a Mylar bag because it recreates the original air-tight seal, thus making it great for food storage and long-term protection.
What You will Need
- Hair straightener, impulse sealer, or clothes iron.
- Flat surface resistant to heat
- Clean opening of bag
Step by Step Heat Sealing a Mylar Bag
- Let out any excess air from the bag. Oxygen causes food to spoil faster.
- Ensure that the inside of the opening is clean, free of anything that could prevent the bag from sealing closed.
- Adjust your heat source, so there is not too much heat (which could melt your bag) or not enough heat (which will not seal your bag).
- Heat seal the top edge of your bag for 2–3 seconds with your heat source.
- Allow the seal to cool and test for an airtight seal by lightly pulling down on the seal after it has cooled.
This works extremely well for flour, sugar, rice, dog food, snacks, supplements, and emergency storage.
For even longer storage or added oxygen protection, vacuum sealing Mylar bags is another effective option.
Resealing Mylar Bags With Zipper Closures
Mylar bags now use a built-in zip seal for convenience rather than for extended storage.
Zipper seals are good for:
• Products Purchased Daily
• Pet Food/Treats
• Retail Products that are Open/Closed Frequently
To properly reseal your mylar bags:
1) Press down firmly across the whole zipper from end to end.
2) Check the corners for any gaps.
3) Do not fill the bags too full, or they may not be able to close completely.
4) Heat seal the bag (optional)
While zipper seals are easy to use, they do not create a completely airtight seal. To create an airtight seal for long-term storage, use a heat seal above the zip seal.
Can You Reseal Mylar Bags Multiple Times
Mylar bags that can be resealed are typically used to contain:
• Food for long-term storage
• Dog and pet food/treats
• Protein powders, vitamins, and other dietary supplements
• Preparedness supplies/equipment
• Packaged retail products after sampling
The most important factor in using a resealable mylar bag is to select the type of resealing method that will keep the products inside as fresh as possible for the duration that is needed for those products to remain fresh.
Resealing often leads to questions about whether Mylar bags are actually reusable and how many times they can be used safely.
Common Errors for Resealing Mylar Bags
It only takes a few minor blunders to cause an otherwise perfect seal to fail.
- Sealing on top of crumbs or dry powder
- Overheating causes the two layers to melt into each other
- Trapped air in the bag
- Using zipper only for long-term storage
Sealing correctly will greatly benefit from an added effort of an additional 10 seconds.
Final Answer:
Yes, Mylar bags can be resealed after opening. You can reseal them using heat from a hair straightener, iron, heat sealer or impulse sealer, to create an airtight seal, or by closing a built-in zipper if the bag has one. Heat sealing provides the best protection for food storage, while zipper seals work well for short-term or frequent use.
Re-sealing is a Mylar bags greatest advantage to using this type of packaging. With Mylar bags you are in control of your product’s freshness and ability to be protected. These bags provide a consistently reliable packaging and storage solution when resealed properly.
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