What is the difference between compostable and biodegradable?

Biodegradable only means a material breaks down eventually, somewhere — without a defined environment and timescale the word carries no information. Compostable is a testable property: certifications such as EN 13432 (EU) and ASTM D6400 (US) verify that a film disintegrates and biodegrades under industrial composting conditions within a defined period. Always ask for the scheme name and certificate number; a compostability claim without them is just marketing.

Will a certified compostable mailer break down in a home compost heap?

Not necessarily. EN 13432 and ASTM D6400 test industrial composting conditions — elevated, controlled temperatures a garden heap rarely reaches. Home compostability is a separate, stricter certification, best known through the TÜV OK compost HOME scheme. If your customers realistically only have a garden heap, either specify a film certified for home composting or choose a paper-based pack instead.

Are recycled PE mailers recyclable at kerbside?

It depends on where your customers live. In Germany, packaging films belong in the lightweight-packaging collection; in much of the US, film is collected via store drop-off rather than at the kerb. What the mono-material design guarantees is that recovery stays technically possible — one polymer, sortable, no laminate. The honest move is to print disposal instructions for the collection system your customers actually have.

Is a paper mailer protective enough for fragile products?

For soft goods, books and small rigid items, yes — and a padded paper mailer with a honeycomb cushioning layer covers most accessories and small electronics while keeping everything in one kerbside paper stream. For genuinely fragile items like ceramics or glass, combine honeycomb wrap with a box, deliberately kept fibre-only. Paper's real limits are moisture and heavy, sharp items — for those, judge protection first and stream second.

What does mono-material mean, and why does it matter?

Mono-material means the pack is made from a single polymer or a single fibre type instead of a laminate of several. Sorting plants cannot separate multi-material laminates, so those packs are effectively unrecyclable by design. A single-material pack can be sorted into its stream, scores better in the design-for-recycling gradings EU packaging law is phasing in, and increasingly pays lower eco-modulated EPR fees.

Which of the three mailer types is cheapest?

There is no fixed ranking — it depends on size, thickness, print and volume. As a mechanism: commodity PE film benefits from the largest production base, paper pricing scales with grammage, and compostable resins generally carry a premium driven by smaller production volumes and the certification chain. The honest way to compare is to quote the same size, protection level and print across all three streams — exactly what our RFQ process does within 24 hours.

Compostable, recyclable or mono-material — which mailer is right for your brand?

Ask three packaging suppliers for a sustainable mailer and you will get three different answers: a certified compostable film, a 100% recycled PE mailer, and an all-paper envelope. Each of them can be the right call. Each of them can also be an expensive label on the wrong pack — because what decides whether a mailer genuinely performs better at end-of-life is not the word printed on the front. It is the disposal stream it actually ends up in.

This guide walks through the three streams as they really work, matches them to product categories, and flags the traps where brands pay extra for a claim their customers can never act on.

Already know your direction? Send size, quantity and material family through our RFQ form — we come back with a quote and a concrete material recommendation within 24 hours.

Start with the bin, not the material

A mailer's end-of-life story is only as good as the infrastructure behind it. A pack that is recyclable in theory but never collected in practice performs exactly like general waste — just with a better-looking print job. So the first question is not which material is greenest (a question we refuse to answer in the abstract), but: which collection systems do your customers actually have at their kerb?

Three streams matter for e-commerce packaging:

Industrial composting — the route for certified compostable films.
The paper stream — kerbside paper and cardboard collection, the oldest and most reliable recycling loop.
The plastic film stream — collection and recycling of polyethylene films, where mono-material design decides whether recovery is possible at all.

Let's take them one at a time, honestly.

Stream 1: industrial composting — strong story, infrastructure-dependent

Compostable mailers are typically made from PLA+PBAT film blends. The certifications that matter are EN 13432 in Europe and ASTM D6400 in the US: both test disintegration and biodegradation under industrial composting conditions — controlled temperature and humidity over a period of weeks to months. A garden heap is a much colder, slower environment; home compostability is a separate, stricter certification (the best-known scheme is TÜV OK compost HOME). A film certified for industrial composting has not automatically demonstrated it breaks down in a backyard bin.

Now the uncomfortable part. Access to industrial composting that accepts packaging varies enormously between countries and even municipalities. Some organics programmes take certified films; many explicitly do not, because at the sorting line a compostable film is hard to distinguish from a conventional one. A compostable mailer that lands in general waste is not a disaster — but it is also not doing the thing its buyer paid a premium for.

Compostable is the right choice when your customer base plausibly has organics collection that accepts certified films, and when you are willing to treat the disposal panel as first-class artwork — a clearly printed instruction with the certification scheme and certificate number, not a leaf icon and a vibe. One firm rule we hold ourselves to: a mailer described as compostable without a named scheme and a certificate number is a claim, not a property. We only reference certificates that a specific production run actually carries.

Stream 2: paper — the boring, reliable one

The paper stream is the least glamorous and the most robust. Kerbside paper collection exists almost everywhere your EU and North American customers live, sorting plants recognise fibre reliably, and — crucially — consumers understand the paper bin without an instruction manual.

That is why an all-fibre pack is often the lowest-risk end-of-life story: paper mailers, padded paper mailers with a honeycomb cushioning layer instead of plastic bubble, and honeycomb wrap as a bubble-film replacement can all travel in a single kerbside stream.

The watch-outs are all about what you add to the fibre. A plastic bubble liner inside a paper envelope produces a pack that is neither good paper nor recoverable plastic. Poly tape wrapped across a box, plastic film windows, and heavy wet-strength coatings all degrade the bale quality or get the pack rejected outright. The design rule is simple: keep it fibre-only, or accept that you have left the paper stream.

Paper's genuine limits: it dislikes moisture, and matching film-level puncture protection takes grammage — which is weight, which is freight. For most soft goods and small rigid products, honeycomb padding closes that gap; for heavy or sharp items, be honest about whether fibre alone is enough.

Stream 3: PE film — where mono-material earns its keep

A 100% recycled PE mailer plays a different game: one polymer, designed so that film recovery stays possible. Film recycling is less mature than rigid-plastic recycling — in Germany films go into the lightweight-packaging collection, in much of the US they rely on store drop-off rather than kerbside — but the stream exists and is growing, pushed hard by regulation.

This is where mono-material stops being jargon. A laminate of two or three different polymers cannot be separated at any realistic sorting plant; it is designed-in unrecyclability. A single-polymer PE mailer, printed within sensible ink-coverage limits, can be sorted, recycled where film collection exists, and scores far better in the design-for-recycling grading systems that EU packaging law is phasing in. One polymer, one print system, one honest sentence on the pack.

Two properties people constantly blur: recycled content (what the mailer is made from — verified by chain-of-custody schemes such as GRS) and recyclability (what can happen to it afterwards). They are independent. A good spec states both; a lazy one hopes you won't ask.

Not sure which stream fits your market? Tell us where your customers are and what you ship — start an RFQ and we'll recommend a stream and spec with the quote, within 24 hours.

Which stream for which product

There is no moral hierarchy between the three streams — matching the stream to your customers' actual bins is the responsible choice. As a starting grid:

Apparel and soft goods — a recycled PE mailer or paper mailer, cut to the folded-garment grid so you stop shipping air. High volume rewards the simplest possible disposal story.
Beauty, supplements, small accessories — a padded paper mailer keeps protection and disposal in one fibre stream; compostable film works where the brand story supports it and the disposal panel is done properly.
Ceramics, glass, fragile goods — honeycomb wrap plus a box, deliberately kept fibre-only so the whole pack goes into one bin.
Books, prints, media — paper, full stop. The stream is universal and the product tolerates it.
Wellness, refill and garden-adjacent brands — the natural home for compostable film, because these customers are the most likely to have (and use) organics collection.

The traps: don't pay for a label

Five claims that should make you slow down before signing a purchase order:

Unqualified 'biodegradable'. Without a stated environment and timescale it is meaningless — everything biodegrades eventually. Oxo-degradable additives, which fragment film into pieces, are banned in the EU outright.
'Compostable' with no scheme and no certificate number. If the supplier cannot name EN 13432 or ASTM D6400 and produce the certificate for your film and thickness, you are buying a word.
Paper-look laminates. Paper outside, plastic inside: rejected by the paper stream, invisible to the film stream. The worst of both worlds, sold on appearance.
Recycled content standing in for recyclability — or the other way round. Ask for both, verified separately.
Assumed infrastructure. A disposal instruction that tells customers to do something their municipality doesn't offer converts goodwill into cynicism. Print instructions for the bin they really have.

Four questions that settle it

Where do your customers live, and which collections exist there — organics, paper, film?
How much protection does the product genuinely need in transit?
What do the EPR fee schedules reward in your markets? Fees are increasingly modulated by recyclability, so the stream choice shows up on an invoice, not just a label.
What story can you print honestly — with a scheme name and certificate number where one is claimed?

If you can answer those four, the material almost picks itself. And if you'd rather argue it through against a real quote: send us your dimensions, quantity and product via the RFQ form — dieline, size and quantity are all we need, and you'll have numbers and a recommendation within 24 hours. Digital sampling runs 5–7 days, so testing the honest option costs you a week, not a season.

Our regulatory explainers always state effective dates and scope. They are not legal advice.