These 5 x 4 x 3 inch kraft corrugated mailers are built from ECT-32-B single wall B-flute corrugated board, folding into a one-piece enclosure that forms double walled reinforcement on the front and sides. No tape, glue, or staples are needed to secure the closure, reducing pack station labor and consumable costs.

The compact footprint suits e-commerce fulfillment centers, retail distribution operations, and manufacturing facilities shipping small hardware, cosmetics, specialty foods, or similar products that require a lightweight but crush-resistant corrugated solution. The self-locking format is particularly well suited to high-throughput pack lines where speed and consistency matter.

Each mailer weighs approximately 0.14 lbs and ships flat for efficient stacking and storage. Sold in bundles of 50, with case-quantity ordering available for facilities with sustained volume needs.