Mylar Bags

A custom mylar bag is a flexible packaging pouch made from a metallised polyester film. The film blocks light, air, and moisture, which is why it keeps products fresh for months rather than days. Unique Custom Boxes prints and manufactures these bags to your exact size, closure, and design, so every bag doubles as protection and branding. We work with businesses across the United Kingdom who need packaging that holds up in transit and looks right on a shelf. The main reason companies switch to mylar is protection. It keeps out the three things that spoil most products over time: light, oxygen, and damp. Coffee stays aromatic, dried fruit stays crisp, snacks stay crunchy, and cannabis or herbal products hold their strength and smell. We supply mylar bags for food, coffee, tea, cosmetics, supplements, CBD, and cannabis brands throughout the UK, from independent producers to established retailers.

How Mylar Bags Are Made

Mylar is a polyester film known for its strength and shine. You've handled it before without realising, in a bag of coffee, a foil balloon, or an emergency blanket. It's thick and glossy, and it resists tearing far better than standard plastic or paper. Each bag has three working parts. The film gives it structure and barrier strength. The print sits on top, so your logo, colours, and product information show clearly. The closure, a zipper, heat seal, or resealable strip, determines how the bag opens and closes day to day. Put together, you get a bag that's airtight, durable, and simple to reseal without losing its grip.

Who Uses Mylar Bags

Cannabis and hemp brands were among the first to rely on mylar, mainly for the smell-proof seal and the option to run bags that are partly or fully opaque. Many regions require cannabis packaging to block light and stay child-resistant, and mylar handles both without extra tooling costs. Outside cannabis, the list runs long. Coffee roasters and tea brands use it to lock in aroma. Dried fruit, nut, and snack suppliers use it to stop moisture getting in. Cosmetics and spa brands use it to protect formulas from light and air. Pharmaceutical and supplement companies use it to shield contents from humidity during storage and shipping. If a product needs to stay fresh, dry, or scent-sealed, mylar is usually the material behind it.

Smell Proof and Vacuum Seal Options

Coffee and cannabis share the same packaging problem: strong smell. Walk into a coffee shop and you don't smell every bag on the shelf. The mylar seal keeps that scent locked in until someone opens it at home. The same barrier works for herbs, spices, and cannabis products that need to stay discreet. Mylar also holds up well under a vacuum sealer. Pulling the air out before sealing extends shelf life further, which matters for bulk food storage, dried goods, and any product where oxygen exposure causes spoilage. Yes, our mylar bags can be vacuum sealed, and we can advise on the right film thickness for your sealing equipment.

Styles We Manufacture

We produce custom mylar bags in the formats businesses actually order:

• Zipper mylar bags, with a track-zip closure built for repeat use.
• Pinch n pull bags, for quick open-and-close without a full zipper track.
• Stand-up pouches, with a flat base so the bag stands upright on a shelf.
• Flat bottom pouches, with a wider base and more room for branding.
• Direct print bags, with full-colour printing straight onto the film.
• Mylar kraft bags, combining a kraft paper finish with the mylar barrier underneath.
• Child-resistant bags, built with resistance mechanisms for regulated products.
• Tamper-evident bags, with a seal that shows clearly if the bag has been opened in transit.

Whatever your product, we build the bag around it rather than asking you to fit a template.

Why Mylar Bags Work

A few reasons these bags keep showing up across so many industries. They block moisture and humidity, so contents stay dry through storage and shipping. They're simple to use, since most come with a zipper or resealable strip that opens and closes without tools. They hold an airtight seal, which keeps snacks, coffee, and dried goods tasting fresh far longer than standard packaging. They come in whatever size you need, from small sample pouches to bulk storage bags. They protect flavour and aroma by blocking light and odour transfer both ways. They stop spills, since the seal holds against liquids and oils as well as air. And they're genuinely reusable and recyclable, which matters if your brand markets itself on sustainability.

Why Choose Unique Custom Boxes

We're a UK packaging manufacturer, based in London, and we build bespoke mylar bags to your exact specification rather than adapting something off a shelf. A few things set us apart:

• No die and plate charges. Custom tooling is part of the price, not an add-on.
• Low minimum order quantities. Start from as few as 50 units, which works for startups as well as established brands ordering wholesale.
• Free shipping across the UK, with orders delivered in 8 to 12 days.
• Free design support from our in-house team, so your artwork is print-ready before production starts.
• 24/7 customer support, so you're never waiting days for a reply.

Eco-friendly material options, including recyclable film and soy-based inks, for brands that want sustainable packaging without giving up on protection. We work with businesses from London to Glasgow, Manchester to Leeds, Birmingham to Bristol, across food, coffee, cosmetics, CBD, and cannabis packaging. Pricing is transparent throughout: what we quote is what you pay, with no hidden setup fees.

Place Your Order

If you need custom mylar bags that protect your product and carry your branding, get in touch with Unique Custom Boxes. Request a free quote, speak to our design team about sizing and closures, and get a sample before you commit to a full production run. Call +44-7852-208627 or email info@uniquecustomboxes.co.uk to get started.