These 10 x 13 inch black poly mailers are constructed from 2.5 mil polyethylene — a durable, lightweight envelope format with an opaque black exterior that conceals contents for discretion and a silver inner lining that provides a clean interior surface. The self-seal adhesive strip eliminates the need for tape, and high-strength seams hold contents securely even when packed near capacity.

These mailers are a practical fit for apparel brands, subscription box operations, promotional goods distributors, and publishing fulfillment centers shipping paperback books, magazines, or catalogs. The 10" x 13" opening handles folded soft goods, flexible media, and flat retail merchandise without added bulk.

The 2.5 mil polyethylene construction resists punctures, tears, and moisture through standard parcel handling. Postage labels, stamps, and shipping ink adhere directly to the outer surface without pretreatment. Each case contains 100 mailers and ships via parcel carrier.