These 12 x 15 1/2 inch blue poly mailers are built from 2.5 mil polyethylene with a permanent self-seal adhesive strip for fast, tool-free closure. The blue exterior and silver interior lining give these mailers a distinctive look, and the outer surface accepts labels, stamps, and standard shipping ink without pretreatment.

The colored exterior makes these mailers practical for color-coded fulfillment workflows, where quick visual sorting by product line, destination zone, or priority tier reduces handling errors on the pack line. Apparel brands, subscription box operations, and direct-to-consumer retailers also use the blue finish for a consistent unboxing identity at the point of delivery.

Construction features high-strength seams that hold at capacity, and the lightweight film keeps package weight low relative to corrugated alternatives for eligible flat goods. Sold in cases of 100; ships via parcel carrier.