How Much Weight Can a Poly Mailer Hold?

If you ship products internationally, you’ve probably asked yourself: How much can this poly mailer actually hold before it fails? It’s a practical question with real consequences. A blown-out bag means lost product, unhappy customers, and costly reshipments.

Here’s what you need to know about poly mailer weight capacity, strength, and how to choose the right bag for your shipments.

The Short Answer: It Depends on Thickness and Size

What actually determines how much a mailer can hold comes down to three factors:

• Thickness (micron or mil)
• Material quality (virgin vs. recycled resin)
• Size

Thickness Is the Biggest Factor

Poly mailer thickness is typically measured in microns (µm) or mil (1 mil = 25.4 microns). Common mailers range from 50 to 100 microns, with heavier-duty options going beyond.

Here’s a practical reference based on industry experience: