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The BSC PREFERRED MLR4K is a self-sealing kraft corrugated mailer sold in packs of 50, designed for shipping small, lightweight fragile items without tape, glue, or staples. Manufactured from 200/ECT-32-B kraft corrugated board, each mailer folds to create double walls of protection on the front and sides, providing crush resistance during transit. The lightweight construction helps reduce postage costs, making this a practical choice for warehouses, distribution centers, and shipping departments that process high volumes of small parcel shipments. The pack weighs 10.06 pounds and measures 17 inches by 22 inches by 6 inches in packaged form.
These mailers are suited for residential and commercial shipping applications where fragile or delicate items require extra protection without adding significant package weight. The self-sealing design eliminates the need for additional sealing supplies, streamlining the packing process on a busy shipping line. Warehouse staff, fulfillment operations, and shipping departments will find these mailers effective for books, documents, electronics accessories, and similar small goods that benefit from rigid corrugated protection.
Designed as a general-purpose corrugated mailer suitable for shipping small, lightweight fragile items across standard parcel carrier services.
No tools are required to assemble or seal these mailers. Follow the fold lines to form the double-wall structure before placing the item inside. Ensure the self-sealing flap is pressed firmly and evenly to achieve a secure closure. Store unused mailers flat in a dry environment to maintain board integrity.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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