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Quick answer: stock three sizes and you cover most soft goods: 10 x 13 in for single garments and small items, 12 x 15.5 in or similar for folded hoodies and bundles, and 14.5 x 19 in for bulky clothing. Measure the folded product, then add about 1 inch to the width and 2 inches to the length for the seal and flap.
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Size guide
| Mailer size | Typical contents |
|---|---|
| 6 x 9 in | Jewellery, phone cases, small accessories |
| 10 x 13 in | T-shirts, leggings, scarves, single folded garments |
| 12 x 15.5 in | Hoodies, jeans, two-item orders |
| 14.5 x 19 in | Jackets, bedding, multi-item orders |
How to measure
- Fold the product the way you will ship it.
- Measure width and length of the folded item.
- Add about 1 inch to the width and 2 inches to the length.
- Check thickness: a thick item needs a bigger mailer than the flat measurement suggests.
When not to use a poly mailer
- Fragile, sharp or rigid items: use a bubble mailer or a box.
- Items that crush, such as boxed cosmetics: use a box.
- Products where packaging presentation matters to the buyer.
Why it saves money
Poly mailers are light and compact, which keeps parcels out of dimensional-weight pricing and often within USPS cubic softpack tiers. See cubic pricing explained.