13"x16"with 4" gusset, tear-strip; 1.57" Lip; 100 pcs/bx / 5 BX/MSTR

Gusseted bottom for bulky productsPuncture resistant, tamper proof, & waterproofProvides excellent protection during shipping

Expansion Poly Mailers are the perfect solution for shipping bulky or larger items. Equipped with a gusseted bottom, these mailers expand allowing more room when shipping books, binders, and more! These mailing envelopes prevent punctures and tears when shipping heavy or irregular objects.

A self-sealing lip with a synthetic rubber adhesive provides a safe and secure way to ship packages. Lightweight expansion mailers reduce shipping costs compared to corrugated boxes.