Custom Mylar Bags Printed Pouches That Seal In Freshness

What Are Mylar Bags and Why Brands Use Them

“Mylar” is the popular name for bags made from BoPET film (biaxially oriented polyester), usually laminated with an aluminum foil or metallized layer and a food-safe sealant layer. The result is a strong, flexible pouch with excellent barrier properties: it slows down oxygen and moisture, blocks light and helps hold in aroma. That is why custom Mylar bags are a first choice for snacks, gummies, coffee, tea, herbs, supplements, pet treats and many other products that lose quality when exposed to air.

Compared with jars and rigid boxes, Mylar pouches weigh less, take up far less shelf and warehouse space, ship flat before filling and cost less per unit to store and transport. And because the whole surface can be printed, a printed Mylar bag works as packaging, label and advertisement in one.

• Freshness: multi-layer film protects flavor, aroma and texture for longer.
• Odor control: foil layers and a tight heat seal help keep strong smells inside.
• Light protection: opaque film shields light-sensitive products from UV.
• Branding: edge-to-edge printing on the front, back and gusset.

Barrier Film and Thickness: Choosing the Right Material

The film structure decides how well your bag protects the product. Most custom Mylar bags combine an outer printable layer, a barrier layer and an inner sealant layer.

• Foil laminate: the highest barrier against oxygen, moisture and light. Ideal for edibles, coffee and products that must stay fresh for months.
• Metallized PET: a bright metallic look with a good barrier at a lower cost.
• Clear PET: fully see-through film when showing the product matters most.
• Kraft paper laminate: a natural, earthy outer look with a foil or film barrier inside.

Thickness is measured in mil (thousandths of an inch). Lighter pouches suit dry snacks and samples, while thicker films (around 4–7 mil) add puncture resistance for sharp, heavy or long-storage products. Tell us what you are packing and how long it needs to stay fresh, and we will recommend a film and thickness.

Features and Add-Ons for Mylar Pouches

• Resealable zip lock: standard press-to-close zippers keep products fresh after opening.
• Tear notch: a clean, easy first opening above the heat seal.
• Hang hole: round or sombrero holes for peg-hook retail displays.
• Clear window: any shape, from a simple rectangle to a custom die-cut outline.
• Degassing valve: a one-way valve for freshly roasted coffee beans.
• Rounded corners and custom shapes for a polished, premium feel.
• Tamper-evident heat seal so customers know the bag has not been opened.

What to Print on Your Mylar Bag

• Front: brand logo, product name, flavor and net weight.
• Back: ingredients, nutrition or supplement facts, allergens and directions where required.
• Business details: company name, address or website and a QR code.
• Batch or lot number and a best-before date area.
• Warnings or regulatory text required for your product category.

Labeling rules depend on the product and where it is sold, so confirm the required wording with your regulatory advisor. We will lay out each panel so everything fits cleanly and stays easy to read.

Sizes: How to Choose the Right Mylar Bag Size

Mylar bag sizes are usually listed as width × height (plus bottom gusset for stand-up pouches). The easiest way to choose is to start with your fill weight, for example 3.5 g, 1 oz, 4 oz, 8 oz or 1 lb, and the density of your product: light, bulky products like popcorn or tea need more volume than dense products like coffee or sugar. Leave space above the product for the zipper and heat seal. Share your product and fill weight and we will suggest a size, then show it on a free 3D mockup.