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The BSC PREFERRED RM4 is a rigid stayflat mailer built to protect photos, documents, and other flat materials during transit. Constructed from .036 kraft chipboard, each mailer provides firm, lightweight protection without requiring additional stiffeners. The tab lock closure secures contents without tape or extra fasteners. These mailers ship in cases of 100 units, making them a practical stock item for shipping departments, print shops, fulfillment operations, and professional service offices that send flat materials on a regular basis.
The RM4 is suited for residential and commercial shipping applications where flat, rigid protection is needed. The lightweight chipboard construction helps keep package weight low, which can reduce postage costs on high-volume outbound shipments. These mailers are a direct-use solution for sending photographs, certificates, contracts, blueprints, and similar single-flat or multi-sheet documents that cannot be folded or rolled.
Designed as an OEM-equivalent replacement for part number S-2859. Suitable for general stayflat mailing applications requiring chipboard mailers of this size and construction.
No tools or installation are required for these mailers. Insert contents flat, fold the tab lock closure to secure the envelope, and apply postage or shipping labels as needed. Handle chipboard mailers in a dry environment to prevent moisture absorption that could compromise rigidity during transit.
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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