Poly Mailer Size Guide
Fold, measure, add about an inch each side. These common sizes are a rule of thumb, not a carrier requirement.
| Mailer size | Typical items |
|---|---|
| 6 x 9 in | Jewelry, small accessories, socks |
| 10 x 13 in | T-shirts, tanks, leggings, a folded dress shirt |
| 12 x 15.5 in | Jeans, hoodies, sweaters |
| 14.5 x 19 in | Coats, bulky knits, multi-item bundles |
| 19 x 24 in | Very bulky outerwear, large bundles |
Unit-cost math
Cost per mailer = pack price ÷ mailers in the pack. Bigger packs usually lower the unit cost, but only if you'll use them. Add tape and the label to get your cost per package — the shipping cost calculator does it for you.
Tips
- Weigh the packed item, mailer included, before you buy postage.
- Keep two or three sizes on hand rather than every size.
- Check current prices for poly mailers on Amazon.
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FAQ
How do I pick a poly mailer size?
Fold the item the way you'll ship it, measure, and choose a mailer at least about an inch bigger on each side so it seals flat without straining the seams.
How do I work out the cost per mailer?
Pack price ÷ number of mailers. For example, $20 for 100 is $0.20 each. Add it with tape and label to get your cost per package.
Can I ship shoes in a poly mailer?
It's safer to ship shoes in a box; mailers don't protect shape. Check the platform's packaging guidance.