A kraft paper mailer is a paper shipping envelope, usually made from brown or white kraft, with a self-seal strip and often a tear-strip for opening. For an Australian e-commerce brand it is the middle option between a flimsy poly satchel and an over-specified box: it protects flat and semi-rigid goods, it recycles in the kerbside paper bin, and it carries print well for an on-brand unboxing.
This guide covers the four main types, how kraft compares with poly, when a mailer beats a box, and how to choose a size. For the products themselves, see kraft paper mailers and bags; for a branded or bespoke run, the custom kraft paper mailer service.
Key points
- Four types: flat, gusseted, paper-padded (honeycomb-lined) and kraft bubble. Match the type to how fragile and how thick the product is.
- Kraft wins on recyclability, brand feel and protecting bend-sensitive flat goods. Poly wins on price, water resistance and raw toughness.
- A paper mailer usually ships cheaper than a box for the same soft or flat item because it keeps dimensional weight down.
- Paper-padded and kraft bubble mailers give real cushioning while staying kerbside recyclable.
- Size the mailer to the product with minimal slack; oversizing wastes postage and looks careless.
The four types of kraft paper mailer
1. Flat kraft mailer. A plain paper envelope with a self-seal strip. Best for lightweight, non-fragile, bend-tolerant or thin rigid goods: apparel, textiles, prints protected by a stiffener, stationery, flat accessories. Uses the least material and tends to have the lowest damage rate when the product suits it.
2. Gusseted kraft mailer. A flat mailer with expanding side or bottom folds, so it opens out to take a thicker or bulkier product without moving up to a box. Good for chunkier apparel, multi-item orders, homewares. Do not overfill: the seams are the limit, so run ship tests before you switch a whole range across. See custom gusseted kraft paper mailers.
3. Paper-padded mailer (honeycomb-lined). A kraft outer with an expanded honeycomb-paper cushioning layer inside. It gives impact and compression protection similar to a bubble mailer while staying 100% paper and kerbside recyclable. This is the strong middle ground for items that are a bit fragile but do not need a box. See our honeycomb mailer guide.
4. Kraft bubble mailer. A kraft paper outer with a plastic bubble lining. It protects scratch- and knock-sensitive goods and resists moisture better than plain paper, but the plastic liner means it is not a clean single-material recycle unless the layers separate. A step toward paper without the full recyclability of a honeycomb-lined mailer. See custom kraft bubble mailers.
Kraft vs poly mailers: the honest comparison
Neither is simply “better”. They trade off.
| Kraft paper mailer | Poly (plastic) mailer | |
|---|---|---|
| Recyclability | Kerbside paper bin (plain/honeycomb types) | Soft-plastic drop-off only; often landfill in practice |
| Brand / unboxing | Premium, natural feel; takes print well | Utilitarian; print works but reads cheaper |
| Bend protection | Holds its shape, protects flat goods | Flexible, no bend protection |
| Water resistance | Low unless coated | Naturally water-resistant |
| Raw toughness | Tears if snagged or overstuffed | Stretches rather than tears |
| Cost per unit | Higher | Lower, often significantly |
| Weight | Heavier | Very light |
Choose kraft for flat or semi-rigid bend-sensitive goods, for any brand where the parcel is part of the experience, and where a recyclable parcel matters to your customers or your packaging reporting.
Choose poly for soft, squashable, scratch-sensitive goods where moisture and rough handling are the main risks and cost is tight.
Plenty of brands run both: kraft for the hero products and gift orders, poly for bulk basics.
Mailer vs box: when to drop the box
If you are using a box only because the item feels like it needs protecting, a mailer often does the job for less. The reason is dimensional weight: carriers bill the greater of actual weight and a volume-based figure, and a rigid box carries a DIM-weight penalty that a thin mailer avoids. For soft or flat goods, switching a box to a mailer commonly cuts 20 to 40% off the per-parcel cost.
Keep the box for anything genuinely fragile, rigid, heavy, or that needs to stack and hold its shape in a pallet. Move to a paper mailer for apparel, textiles, flat accessories, books with a stiffener, and small non-fragile goods. Move to a paper-padded mailer for the in-between: a bit fragile, not box-worthy.
What to ship in each
- Flat kraft mailer: t-shirts, knitwear, scarves, tea towels, enamel pins on backing card, prints with a rigid insert, notebooks, flat homewares.
- Gusseted kraft mailer: hoodies, denim, bundled multi-item apparel orders, soft homewares, small toys.
- Paper-padded / honeycomb mailer: skincare and cosmetics, small ceramics, candles, glass-free giftware, electronics accessories, jewellery boxes.
- Kraft bubble mailer: items where surface scratching and light moisture are the main risks and a fully paper option is not available.
Custom printing and branding
Kraft mailers take flexographic or digital print well. Common approaches:
- One-colour logo repeat on natural kraft: understated, cheapest, timeless.
- Full-colour digital on white kraft: sharper colour, better for detailed artwork, lower minimums, higher unit cost.
- Inside print on the flap or interior: a low-cost surprise-and-delight touch.
- Custom size and construction: a mailer built to your product’s exact dimensions cuts void space and postage.
Keep it recyclable by printing with water-based inks and avoiding plastic laminates. Carewell handles artwork to delivery through the custom printed kraft mailer service.
How to choose a size
- Measure the product at its largest packed dimensions (lay soft goods flat and folded as you would ship them).
- Add a small allowance, roughly 15 to 25 mm on width and length for a flat mailer, more for a gusseted one, so the self-seal closes without straining the seams.
- Avoid oversizing. Slack in the mailer means the product moves, the parcel looks sloppy, and you may pay more postage.
- Rationalise to a few sizes. Two or three mailer sizes usually cover an apparel or homewares range; more than that slows the pack bench.
- Ship-test a real product in the chosen size through your actual carrier before committing to a pallet.
Recyclability, plainly
- Flat and gusseted kraft mailers: kerbside paper and cardboard recycling. If there is a plastic self-seal liner strip, most councils still accept it, but a paper-based adhesive strip is cleaner.
- Honeycomb paper-padded mailers: kerbside paper recycling; the honeycomb layer is paper.
- Kraft bubble mailers: the plastic bubble layer needs separating for the paper to be recycled, which customers rarely do. Treat these as a partial solution.
- For a fully single-material parcel, pair a paper mailer or kraft carton with paper void fill and a water activated tape or paper-tape seal.
How Carewell Group fits: the mailer, the print and the fill from one place
Carewell Group is an Australian packaging manufacturer and supplier. We design custom packaging around your product, add your branding and print, and supply the whole dispatch line from one place, so moving to paper mailers is not another project for your team to run.
- Kraft paper mailers in every construction: flat, gusseted, honeycomb paper-padded and kraft bubble. Browse kraft paper mailers and bags.
- Custom sizing, so the mailer fits the product and you stop paying to ship air. Custom kraft paper mailer solutions.
- Custom print and branding in water-based inks so the mailer stays recyclable: custom printed kraft mailers.
- The rest of the plastic-free parcel: paper void fill, kraft cartons, honeycomb paper mailers and recyclable water activated tape.
- Custom design and engineering. If your product needs a specific mailer, insert or closure, we build it to fit rather than making you adapt to stock sizes. From engineering to finished, ready-to-use packaging, your business gets a solution, not another task.
Carewell operates from NSW with warehousing in Smithfield, Matraville and Padstow, works with clients across grocery and retail, e-commerce, food and beverage, and industrial and manufacturing, and is certified to ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018, and an APCO member.
Working out which mailer suits your range? Request a quote and samples or call +61 (02) 8760 1491.
Frequently asked questions
Are kraft paper mailers recyclable?
Flat, gusseted and honeycomb paper-padded kraft mailers go in the kerbside paper and cardboard bin. Kraft bubble mailers have a plastic bubble lining that needs separating first.
Kraft or poly mailers, which should I use?
Kraft for flat or semi-rigid bend-sensitive goods, brand-led unboxing, and a recyclable parcel. Poly for soft, scratch-sensitive goods where moisture resistance and low cost matter most.
Can a paper mailer replace a box?
For apparel, textiles, flat accessories and small non-fragile goods, yes, and it usually ships cheaper because it keeps dimensional weight down. Keep boxes for fragile, rigid, heavy or stackable items.
Do paper padded mailers actually protect the product?
Yes. Honeycomb paper-padded mailers give impact and compression protection close to a bubble mailer while staying 100% paper.
Can kraft mailers be custom printed?
Yes, flexographic or digital, on natural or white kraft, normally with water-based inks so the mailer stays recyclable. Custom sizes are available too.
Sources
- EcoEnclose and EcoPackables, kraft vs poly mailer comparison and mailer type guidance: ecopackables.com
- Enviro Packaging, paper mailers vs padded paper mailers: enviropackaging.com
- 2026 shipping-cost analyses, poly mailers vs boxes and dimensional-weight impact: pluspackaging.com
- Australian Packaging Covenant Organisation (APCO): apco.org.au
Written by Alif Vasaya, digital and content strategy, Carewell Group. Carewell Group is an Australian packaging, food packaging, tape, industrial safety and 3PL supplier. Last updated 9 September 2026.