Envelope shipping labels from LabelsOnline.com are sized for use on standard business envelopes, poly mailers, bubble mailers, and flat shipping envelopes — giving your outgoing mail a clean, professional appearance whether you’re running a mail merge from a small office, fulfilling e-commerce orders in poly bags, or sending high-volume direct mail campaigns. These labels are formatted to fit cleanly on the face of standard #10, 6" x 9", 9" x 12", and poly mailer formats without overhang or misalignment.

Available in standard white matte, compatible with both laser and inkjet printers on 8.5" x 11" sheets. Many sizes are dimensionally compatible with popular Avery envelope label templates. US-made and backed by our 100% satisfaction guarantee.

Frequently Asked Questions

What size shipping label fits a standard poly mailer?

For a standard 10" x 13" poly mailer, a 4" x 6" or 4" x 5" shipping label fits the face cleanly with room for branding. For smaller 6" x 9" mailers, a 3.5" x 4" or 4" x 3.33" label is a good fit. The 2-5/8" x 1" address label (30-up) is the standard format for addressing #10 envelopes in a laser or inkjet mail merge.

Also shop: Shipping Labels on Sheets | Address Labels | Integrated Shipping Labels

Browse the full envelope shipping label selection below.