These 5 x 5 x 4 inch kraft corrugated mailers are built from ECT-32-B single wall corrugated board and use a one-piece fold design that locks shut without tape, glue, or staples — eliminating fastener costs and reducing pack time at the shipping station.

The folded construction creates double wall thickness along the front and sides, concentrating structural rigidity where transit impacts are most likely. That added panel strength makes these mailers well suited for e-commerce fulfillment, subscription box operations, retail distribution, and manufacturing environments shipping small, dense, or fragile items.

Each mailer weighs approximately 0.22 lbs, keeping actual and dimensional weight costs in check on high-volume outbound shipments. Mailers ship and store flat, minimizing warehouse footprint. Sold in bundles of 50, parcel-friendly.