Custom Heat Seal Mylar Bags

Choosing Barrier Layers and Finishes

Metallised film gives a good barrier at a reasonable cost and has a silvery interior. Foil laminate gives the highest barrier and suits very sensitive products such as ground coffee and long-term food storage. If customers need to see the product, a clear front with a metallised or foil back is a compromise, though a clear panel does let in some light.

On the outside, matt film gives a modern, understated look and reduces glare under shop lights. Gloss film makes colours vivid. Soft-touch matt film feels velvety and is popular with premium snacks and supplements. Kraft paper outer layers laminated to a barrier film suit artisan foods, giving a natural look without losing protection.

Thickness matters for sharp or heavy contents. Nuts, granola and dried pasta can puncture thin film, so tell us what goes in and we will suggest a suitable gauge. For heavy or sharp products, heavy duty mylar bags use a thicker film.

Getting Your Heat Seal Mylar Bags Sealing Properly

Impulse sealers are simple to use but worth setting up carefully. Thicker barrier bags need a longer heat time than thin bags, so run a few test seals at different settings and check them by pulling gently on the sealed edge. A good seal is flat, even and wide, with no wrinkles or gaps. Wipe any powder or crumbs from the inside of the top before sealing, because debris in the seal area weakens it.

Leave enough empty space above the product for the sealer jaws, typically twenty to thirty millimetres. For bags with a zip, seal above the zip, not across it. Oxygen absorbers are often added to long-storage food bags before sealing to remove trapped air; ask us about bag sizes that leave room for one.

If you seal large volumes, a band sealer or a wider impulse sealer speeds things up. Our bags work with standard sealers used by small food producers. A pouch with a tear notch above the seal makes the first opening easier for customers.

Products That Suit a Heat-Sealed Bag

Dried and dehydrated food is the classic use, from camping meals and emergency food stores to dried mushrooms and fruit. Coffee roasters use heat seal bags with one-way valves to let gas out without letting air in. Snack brands use them for crisps, jerky, nuts and trail mix. Supplement and protein powder brands use them for sachets and refill pouches.

Pet food makers, bakers selling biscuits and brownies, and herbalists packing loose leaf tea all use them too. Food-contact grade films are available on request for any product that touches the inner layer directly.

Small producers selling at farmers markets often start with flat heat seal pouches and a simple printed label area, then move to fully printed stand-up bags once a product has proved popular. That route keeps early costs low. If you already know a line will be a steady seller, going straight to printed stand-up pouches saves you relabelling later and gives a more finished look on a shop shelf.

Long-storage food is a special case. Customers buying emergency or expedition food want reassurance that the bag will hold up for a long time in a cupboard, a car boot or a rucksack. A thicker foil laminate, a generous seal width and clear storage instructions on the back all help, and printing a simple fill and seal date panel lets you or the customer note when the bag was packed.

Print Design for Mylar Bags

We print the full surface of the bag, front and back, in full colour. Plan the top margin carefully: the heat seal area and any tear notch should be clear of important text, because they will be crimped or torn. Place the product name, weight and key claims in the upper middle of the front, where they show on a shelf. Nutrition, ingredients and storage advice go on the back.

Metallised film can show through unprinted areas with a silvery shine, which can look striking. If you want a solid white background instead, we print a white underlayer first. Our team checks seal zones and text sizes on your free proof. To show the product, our mylar bags with a clear window keep the same print options.

Ordering Custom Mylar Bags

Send the bag style, dimensions, contents and artwork, and we will email a custom quote within one working day. Prices start from £0.25 per unit depending on size, layers and quantity, with low minimums quoted per job. Different designs or flavours can often be printed together in one run.

Once you approve the free design proof, bags take 4–7 working days to produce and arrive with free tracked UK mainland delivery in 2–3 working days. If bags are misprinted or arrive damaged, let us know within 10 days and we will reprint or refund. Browse the full bags and pouches range for other styles you can order alongside.