Custom Compostable Mailers for Clothing and Soft Goods

What are compostable mailers?

Compostable mailers are mailing bags made from a film designed to break down in suitable composting conditions. In the hand they feel soft and slightly matt, a little like a standard polythene bag.

They work the same way. You fold the goods in, peel the liner off the flap and press it shut. The bag is opaque, so nobody can see what is inside.

Our photos show the usual look: a deep green, black or white bag printed with the brand name and a short message about disposal.

What does compostable mean for a mailing bag?

It means the film is designed to break down into natural matter under the right conditions. Ordinary plastic, by contrast, lasts for a very long time.

How quickly that happens, and whether a home compost heap is enough, depends on the exact material. It also depends on local facilities where your customers live.

For that reason we confirm the material grade and the disposal guidance on your written quote. Print only the claims that paperwork supports, and keep the wording plain.

How do I choose a compostable mailer size?

Sizes are given flat, as width by length. The flap is extra, so it does not count towards the space for your goods.

Fold your item as you would pack it and measure it. Add its thickness to the width and the length, then add around 20 mm so it slides in easily.

A T-shirt folded to 220 × 300 × 15 mm sits well in a 250 × 350 mm bag. For more detail, read our notes on measuring before ordering.

How can compostable mailers be printed?

Artwork can run in a single ink, in two inks or in full CMYK, on one face or both. A solid brand colour flooding the whole bag is a popular look, as the dark green and black bags in our photos show.

Most brands add a short line about what to do with the bag after use. Keep it clear and honest, for example how to dispose of it locally.

Leave a plain panel for the address label, and avoid fine detail near the seams and the flap. Ink can look broken across the heat-sealed edges.

Which mistakes should I avoid with compostable mailers?

Over-claiming is the big one. Words like home compostable or fully plastic-free must match the material paperwork, or you risk misleading customers.

Ordering a year of stock at once can also cause trouble. Compostable film is best used within a sensible period, so order in step with your sales.

Using a mailing bag for hard or sharp items is another. Buckles, glass and boxed electronics should go in a carton instead. A sharp corner can pierce film in a sorting machine, even when the bag is the right size.

Compostable mailer, paper mailer or box?

A compostable mailer keeps the soft, waterproof feel of a plastic bag. A kraft paper mailer with a seal strip gives a dry, papery feel and takes uncoated print well.

For anything that needs a rigid shell, a kraft box is the better choice, like the printed one in our photos. Many brands use bags for clothing and boxes for gifts or accessories.

Postage is usually lower for a bag than a box of the same footprint, because the bag is thinner and lighter. A mixed range of bags and boxes, printed to match, keeps the brand look the same whichever format a customer receives.

Can compostable mailers be used for returns?

Yes. A second adhesive strip lets the customer reseal the same bag to send a return. A tear line makes the first opening clean.

It is worth doing for clothing, where returns are common. Ask for it on your quote, as it changes the unit price slightly.

How do brands talk about compostable packaging honestly?

Customers read packaging claims closely, and vague green wording can do more harm than good. The safest messages are short, specific and easy to check.

Say what the bag is made of in plain words, and tell people what to do with it. If local food waste or garden waste collections will not accept it, say so rather than leaving people to guess.

Avoid percentages and badges unless your material paperwork names them. When we confirm the grade on your quote, use that wording as the basis for anything you print.

Many brands put the disposal message on the back of the bag and keep the front for the logo. That way the parcel still looks clean on a doorstep, and the advice is there when the bag is empty.

How do I order compostable mailers?

Let us know the flat size, the print colours, any returns strip and the quantity. You can also try out artwork in Design Your Box first.

The unit price starts at £0.25, and every job is set down in a written quote. Our design team tidies your layout for free and sends a digital proof that costs you nothing.

Your approval starts a 4–6 business day production window. The finished cartons then travel on a tracked route for 2–3 business days. We pay the delivery to every UK address.

Any bag that turns up misprinted, split or faulty is covered. Share photos with us inside 10 days and those bags are reprinted or refunded.