Custom Mylar Mailing Bags

Choosing a Finish and Colour

Silver is the classic metallic and looks clean and modern. Gold feels warmer and more luxurious, and suits jewellery, evening wear and premium beauty; the print and finish options compared page shows how ink sits on each film. Rose gold sits between the two and is popular with beauty and lifestyle brands. Holographic film shifts colour as it moves, giving a playful, eye-catching look that suits festival fashion, nail art and younger audiences.

There are also matt metallic finishes, which have a softer sheen and feel more understated. A matt silver bag with a black logo looks smart and grown-up, while a glossy holographic bag with a white logo is bold and fun. Choose the finish that matches the feel of your brand rather than the shiniest option available.

Inside, the bag can be white, black, silver or a colour. A contrasting interior, such as a pink lining inside a silver bag, adds a second moment of surprise when the customer opens it.

Sizing Mylar Mailing Bags for Your Products

Mailing bags are measured by width and length, plus the flap. To find the right size, fold or box the product as you will send it, then add around 20 mm to the width and 30 to 40 mm to the length, so the item slides in easily and the flap can seal flat, as the guide to measuring your product explains. A bag that is too tight strains the seal; one that is too loose lets the item shift and looks baggy.

Many brands use two or three sizes to cover their range. A small bag for accessories and single items, a medium bag for one or two garments and a large bag for bigger orders. Keeping to a few standard sizes makes stock management easier and keeps your branding consistent. It is worth checking your carrier's size bands before settling on the largest bag, because a bag a few millimetres over a threshold can push a parcel into a dearer postage class. Designing your sizes to sit just inside those limits saves money on every order without the customer noticing any difference.

If you post items in a retail box, such as a skincare carton, measure the box and allow for its depth when choosing the bag size, because a box takes up length as well as width.

Printing on Metallic Film

Printing on mylar is different from printing on paper. The metallic surface shows through transparent inks, so colours take on a metallic sheen, which is one reason brands keep the artwork simpler than on a printed bubble mailer. To keep colours solid and bright, a white base layer is printed first under the coloured areas. Logos printed in black or white without an underlay give a crisp, high-contrast look on silver and gold.

Simple designs work best. A central logo, a repeat pattern or a short message across the front all look striking on metallic film. Fine detail and small text are possible but can be harder to read against a reflective surface, so we suggest keeping text at a generous size.

Printing on the back of the bag, or a message inside the flap, adds extra branding. Many brands put their social media handle on the back to encourage unboxing posts.

Protection and Practical Details

A standard mylar mailing bag protects against moisture, dirt and minor knocks, but it is not padded. For fragile items, a padded version with a bubble lining is available, and anything heavier belongs in a padded paper mailer or a box. For clothing, beauty in cartons and other non-fragile goods, a standard bag is usually enough.

The self-seal strip is strong and shows if the bag has been tampered with. Some brands choose a bag with two strips, so customers can reuse it to return an item. That is a practical touch that also saves the customer finding their own packaging.

Bags arrive flat, which saves storage space, and they need no tape, no scissors and no folding at the packing bench. A busy dispatch afternoon moves noticeably faster when each order is a matter of slide in, peel and press. A box of mailing bags takes up far less room than the same number of mailer boxes, which helps small brands working from home or a small unit.

Decide Whether Colours Should Shine or Stay Solid Before You Send Artwork

Metallic film changes how ink behaves, so the artwork decision comes first. Printed straight onto silver or gold, every colour takes on a sheen, which suits a bold single-colour logo; printed over a white underlay, colours stay solid and bright, which suits a full-colour design. Mark on your artwork which areas should shine and which should not. Then fold or box the product as you send it, add about 20 mm to the width and 30 to 40 mm to the length, and say if anything fragile needs the bubble-lined version or a second seal strip for returns.

Tell us the sizes, the finish and send the artwork, and a custom quote comes by email within one working day, with a minimum that suits small and growing brands. A free design proof shows the print on your chosen film. Production takes 4 to 7 working days after approval and the flat bags reach UK mainland addresses on free tracked delivery in 2 to 3 working days. Brands that post tees as well often add a plainer custom poly mailer for everyday orders.