How Mylar Bags Used In The Cannabis Industry Are Made

by Lia Thompson January 29, 2023

Written by Lia Thompson, packaging specialist at Creative Labz. Last updated October 4, 2026.

Mylar bags, also known as foil or metallized bags, are a popular packaging option in the cannabis industry, ideal for storing dried flowers and concentrates. Their strong barrier against light, air, and moisture helps maintain the product’s freshness and potency. Let’s explore how these essential bags are made and why they’re so effective.

Step 1: Producing the Polyester Film

The foundation of a Mylar bag is PET (polyethylene terephthalate) polyester film, made by polymerizing ethylene glycol and terephthalic acid. "Mylar" is actually a trademarked name for this kind of film, but the word is now used for metallized barrier bags in general. The resulting plastic is extruded into a thin sheet and stretched to increase durability and strength, making it ideal for packaging.

Step 2: Adding the Aluminum Coating

A thin layer of aluminum is added using vacuum metalizing. This process occurs in a vacuum chamber, where aluminum vapor is applied to the surface of the polyester film. This coating creates a light- and moisture-proof barrier that is essential for preserving cannabis products, as exposure to air and light can degrade potency and freshness.

Step 3: Cutting the Film

Next, the printed and metallized films are laminated with a food-safe sealant layer, usually polyethylene, which is what lets the bag heat-seal. The laminated film is then cut into specific shapes and sizes according to bag design requirements. Customization at this stage allows manufacturers to create tailored solutions for different product needs.

Step 4: Heat Sealing for Airtight Protection

To form the final bag, high heat and pressure are used to seal the edges, creating an airtight enclosure. This airtight seal ensures the cannabis remains fresh and protected from environmental factors that could compromise quality.

Step 5: Custom Printing and Branding

The final step involves adding branding, labels, and product information using methods like flexographic, rotogravure, or digital printing. In practice, printing usually happens on the film before the bag is laminated and formed. Printing transfers ink onto the film, allowing manufacturers and dispensaries to customize the packaging to suit their needs and stand out in a competitive market.

Why Mylar Bags Are Perfect for Cannabis Packaging

Unmatched Protection:
Mylar bags offer an excellent barrier against light, air, and moisture, preserving the product’s freshness and potency.
Tamper-Evident Features:
Many Mylar bags feature tamper-evident seals, giving consumers confidence that the product is safe and untouched.
Customizability:
Cannabis brands can showcase their identity by designing bags with unique logos, strain details, and compliance labeling.
Lightweight and Durable:
These bags are easy to store, transport, and handle, reducing costs for manufacturers and dispensaries.
Environmentally Friendly:
Most Mylar bags are multi-layer laminates that curbside recycling can't process, but their light weight cuts shipping emissions, and resealable bags can be reused many times.

The Importance of Mylar Bags in Cannabis

The cannabis industry depends on proper packaging to maintain the integrity of products and comply with regulations. Mylar bags excel in these areas by providing:

Security: Tamper-evident seals protect products.
Preservation: Airtight and lightproof barriers keep products fresh.
Branding Opportunities: High-quality prints enhance visibility and differentiation in the market.

Conclusion

Mylar bags are a cornerstone of cannabis packaging, offering reliability, convenience, and lightweight efficiency. From their advanced production process to their protective capabilities, these bags meet the demanding needs of the cannabis industry. Whether for dried flowers, concentrates, or edibles, Mylar bags are a secure, customizable solution that supports the industry’s growth and commitment to quality.

For premium Mylar bag options tailored to cannabis needs, check out our selection at Creative Labz!

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Frequently Asked Questions

What are Mylar bags made of?

Typically layers of PET polyester film, an aluminum or metallized barrier layer, and a polyethylene sealant layer, laminated together.

Why are Mylar bags smell-resistant?

The metallized and laminated layers block light, air, and moisture. Once heat-sealed, they hold in odor far better than ordinary plastic bags.

Can Mylar bags be recycled?

Usually not curbside, because the layers are bonded together. Reusing resealable bags is the most practical eco-friendly option.