How to Seal Mylar Bags

Mylar bags have gained immense popularity over recent years due to their ability to store food items safely. Most companies, including the cannabis industry use them as a safe way to safeguard their products, especially during the pandemic. Individuals also use mylar to preserve their buds during lockdowns. Mylar bags are very lightweight yet sophisticated, making it suitable to package and transport your cannabis goods.


Mylar bags are very beneficial when it comes to long term cannabis storage. It keeps your buds potent for as long as you want. All you need to do is seal the bag and keep it in a safe location. You can also place it in a freezer without facing any issues. However, constantly opening your mylar bag to remove cannabis will require you to seal the bag when not in use. Therefore, it's essential to know how to seal your mylar bag. Sealing your mylar bag correctly ensures that your buds stay fresh and potent. However, if you don’t seal your mylar bag correctly, your buds will be exposed to air, become susceptible to mold, and further degrade.


Mylar Bags consist of a polyester film made from stretched polyethylene tetraphalate, which means it’s easier to seal. Mylar bags must be heat-sealed to work at their best. Also, ensure to add the oxygen absorbers because they play a vital role in your buds remaining fresh. It's recommended to have all the essential tools needed to seal your bags before opening your oxygen absorbers to prevent your products' long-term exposure.


So, you already have your Mylar bag filled, and you want to seal it up.

Based on the size of the bag you are using, quart, gallon, or 5 gallons, you can decide on the best heat-sealing method. Allow 6 inches of open space so you can easily send your oxygen absorber before completing the sealing process.



A hair-straitening iron or household iron are the best alternatives to seal 5-gallon bags. It is a more straightforward process than ironing a shirt: passing the iron one or two times creates an excellent seal that makes your products very safe.


Impulse Sealer

Another way to seal your mylar bag is through an impulse sealer. This is one of the simplest methods to heat-seal Mylar bags, but keep in mind that good impulse sealers are costly.


Food Saver

Using a Food Saver is a simple method to seal smaller gallon or quart bags. Some people are still confused about using Food Saver machines for heat-sealing Mylar bags. This is because, in some settings, the food saver may heat-seal before it vacuums all the air out, leading to some frustrations. Nonetheless, you can still leave air in your bags when sealing and remove the air afterward with an oxygen absorber.


It's not recommended for all the bags to have a vacuum-sealed packed appearance. Also, products with high interstitial air volume will often not get volume decreases even though the process has worked. Mylar bags with zip locks also need to be heat-sealed for long-term food storage.